Netty HTTP

Since Camel 2.14

Both producer and consumer are supported

The Netty HTTP component is an extension to Netty component to simplify HTTP transport with Netty.

Stream

Netty is stream-based, which means the input it receives is submitted to Camel as a stream. That means you will only be able to read the content of the stream once. If you find a situation where the message body appears to be empty, or you need to access the data multiple times (eg: doing multicasting, or redelivery error handling), you should use Stream caching or convert the message body to a String which is safe to be re-read multiple times.

Note also that Netty HTTP reads the entire stream into memory using io.netty.handler.codec.http.HttpObjectAggregator to build the entire full http message. But the resulting message is still a stream-based message that is readable once.

Maven users will need to add the following dependency to their pom.xml for this component:

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-netty-http</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

URI format

The URI scheme for a netty component is as follows

netty-http:http://0.0.0.0:8080[?options]

Query parameters vs. endpoint options

You may be wondering how Camel recognizes URI query parameters and endpoint options. For example, you might create endpoint URI as follows: netty-http:http//example.com?myParam=myValue&compression=true . In this example myParam is the HTTP parameter, while compression is the Camel endpoint option. The strategy used by Camel in such situations is to resolve available endpoint options and remove them from the URI. It means that for the discussed example, the HTTP request sent by Netty HTTP producer to the endpoint will look as follows: http//example.com?myParam=myValue, because compression endpoint option will be resolved and removed from the target URL.

Keep also in mind that you cannot specify endpoint options using dynamic headers (like CamelHttpQuery). Endpoint options can be specified only at the endpoint URI definition level (like to or from DSL elements).

A lot more options

This component inherits all the options from Netty, so make sure to look at the Netty documentation as well. Notice that some options from Netty are not applicable when using this Netty HTTP component, such as options related to UDP transport.

Configuring Options

Camel components are configured on two separate levels:

  • component level

  • endpoint level

Configuring Component Options

At the component level, you set general and shared configurations that are, then, inherited by the endpoints. It is the highest configuration level.

For example, a component may have security settings, credentials for authentication, urls for network connection and so forth.

Some components only have a few options, and others may have many. Because components typically have pre-configured defaults that are commonly used, then you may often only need to configure a few options on a component; or none at all.

You can configure components using:

  • the Component DSL.

  • in a configuration file (application.properties, *.yaml files, etc).

  • directly in the Java code.

Configuring Endpoint Options

You usually spend more time setting up endpoints because they have many options. These options help you customize what you want the endpoint to do. The options are also categorized into whether the endpoint is used as a consumer (from), as a producer (to), or both.

Configuring endpoints is most often done directly in the endpoint URI as path and query parameters. You can also use the Endpoint DSL and DataFormat DSL as a type safe way of configuring endpoints and data formats in Java.

A good practice when configuring options is to use Property Placeholders.

Property placeholders provide a few benefits:

  • They help prevent using hardcoded urls, port numbers, sensitive information, and other settings.

  • They allow externalizing the configuration from the code.

  • They help the code to become more flexible and reusable.

The following two sections list all the options, firstly for the component followed by the endpoint.

Component Options

The Netty HTTP component supports 80 options, which are listed below.

Name Description Default Type

configuration (common)

To use the NettyConfiguration as configuration when creating endpoints.

NettyConfiguration

disconnect (common)

Whether or not to disconnect(close) from Netty Channel right after use. Can be used for both consumer and producer.

false

boolean

keepAlive (common)

Setting to ensure socket is not closed due to inactivity.

true

boolean

reuseAddress (common)

Setting to facilitate socket multiplexing.

true

boolean

reuseChannel (common)

This option allows producers and consumers (in client mode) to reuse the same Netty Channel for the lifecycle of processing the Exchange. This is useful if you need to call a server multiple times in a Camel route and want to use the same network connection. When using this, the channel is not returned to the connection pool until the Exchange is done; or disconnected if the disconnect option is set to true. The reused Channel is stored on the Exchange as an exchange property with the key NettyConstants#NETTY_CHANNEL which allows you to obtain the channel during routing and use it as well.

false

boolean

sync (common)

Setting to set endpoint as one-way or request-response.

true

boolean

tcpNoDelay (common)

Setting to improve TCP protocol performance.

true

boolean

bridgeErrorHandler (consumer)

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions (if possible) occurred while the Camel consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. Important: This is only possible if the 3rd party component allows Camel to be alerted if an exception was thrown. Some components handle this internally only, and therefore bridgeErrorHandler is not possible. In other situations we may improve the Camel component to hook into the 3rd party component and make this possible for future releases. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

boolean

broadcast (consumer)

Setting to choose Multicast over UDP.

false

boolean

clientMode (consumer)

If the clientMode is true, netty consumer will connect the address as a TCP client.

false

boolean

muteException (consumer)

If enabled and an Exchange failed processing on the consumer side the response’s body won’t contain the exception’s stack trace.

false

boolean

reconnect (consumer)

Used only in clientMode in consumer, the consumer will attempt to reconnect on disconnection if this is enabled.

true

boolean

reconnectInterval (consumer)

Used if reconnect and clientMode is enabled. The interval in milli seconds to attempt reconnection.

10000

int

backlog (consumer (advanced))

Allows to configure a backlog for netty consumer (server). Note the backlog is just a best effort depending on the OS. Setting this option to a value such as 200, 500 or 1000, tells the TCP stack how long the accept queue can be If this option is not configured, then the backlog depends on OS setting.

int

bossCount (consumer (advanced))

When netty works on nio mode, it uses default bossCount parameter from Netty, which is 1. User can use this option to override the default bossCount from Netty.

1

int

bossGroup (consumer (advanced))

Set the BossGroup which could be used for handling the new connection of the server side across the NettyEndpoint.

EventLoopGroup

disconnectOnNoReply (consumer (advanced))

If sync is enabled then this option dictates NettyConsumer if it should disconnect where there is no reply to send back.

true

boolean

executorService (consumer (advanced))

To use the given EventExecutorGroup.

EventExecutorGroup

maximumPoolSize (consumer (advanced))

Sets a maximum thread pool size for the netty consumer ordered thread pool. The default size is 2 x cpu_core plus 1. Setting this value to eg 10 will then use 10 threads unless 2 x cpu_core plus 1 is a higher value, which then will override and be used. For example if there are 8 cores, then the consumer thread pool will be 17. This thread pool is used to route messages received from Netty by Camel. We use a separate thread pool to ensure ordering of messages and also in case some messages will block, then nettys worker threads (event loop) wont be affected.

int

nettyServerBootstrapFactory (consumer (advanced))

To use a custom NettyServerBootstrapFactory.

NettyServerBootstrapFactory

networkInterface (consumer (advanced))

When using UDP then this option can be used to specify a network interface by its name, such as eth0 to join a multicast group.

String

noReplyLogLevel (consumer (advanced))

If sync is enabled this option dictates NettyConsumer which logging level to use when logging a there is no reply to send back.

Enum values:

  • TRACE

  • DEBUG

  • INFO

  • WARN

  • ERROR

  • OFF

WARN

LoggingLevel

serverClosedChannelExceptionCaughtLogLevel (consumer (advanced))

If the server (NettyConsumer) catches an java.nio.channels.ClosedChannelException then its logged using this logging level. This is used to avoid logging the closed channel exceptions, as clients can disconnect abruptly and then cause a flood of closed exceptions in the Netty server.

Enum values:

  • TRACE

  • DEBUG

  • INFO

  • WARN

  • ERROR

  • OFF

DEBUG

LoggingLevel

serverExceptionCaughtLogLevel (consumer (advanced))

If the server (NettyConsumer) catches an exception then its logged using this logging level.

Enum values:

  • TRACE

  • DEBUG

  • INFO

  • WARN

  • ERROR

  • OFF

WARN

LoggingLevel

serverInitializerFactory (consumer (advanced))

To use a custom ServerInitializerFactory.

ServerInitializerFactory

usingExecutorService (consumer (advanced))

Whether to use ordered thread pool, to ensure events are processed orderly on the same channel.

true

boolean

connectTimeout (producer)

Time to wait for a socket connection to be available. Value is in milliseconds.

10000

int

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

requestTimeout (producer)

Allows to use a timeout for the Netty producer when calling a remote server. By default no timeout is in use. The value is in milli seconds, so eg 30000 is 30 seconds. The requestTimeout is using Netty’s ReadTimeoutHandler to trigger the timeout.

long

clientInitializerFactory (producer (advanced))

To use a custom ClientInitializerFactory.

ClientInitializerFactory

correlationManager (producer (advanced))

To use a custom correlation manager to manage how request and reply messages are mapped when using request/reply with the netty producer. This should only be used if you have a way to map requests together with replies such as if there is correlation ids in both the request and reply messages. This can be used if you want to multiplex concurrent messages on the same channel (aka connection) in netty. When doing this you must have a way to correlate the request and reply messages so you can store the right reply on the inflight Camel Exchange before its continued routed. We recommend extending the TimeoutCorrelationManagerSupport when you build custom correlation managers. This provides support for timeout and other complexities you otherwise would need to implement as well. See also the producerPoolEnabled option for more details.

NettyCamelStateCorrelationManager

lazyChannelCreation (producer (advanced))

Channels can be lazily created to avoid exceptions, if the remote server is not up and running when the Camel producer is started.

true

boolean

producerPoolBlockWhenExhausted (producer (advanced))

Sets the value for the blockWhenExhausted configuration attribute. It determines whether to block when the borrowObject() method is invoked when the pool is exhausted (the maximum number of active objects has been reached).

true

boolean

producerPoolEnabled (producer (advanced))

Whether producer pool is enabled or not. Important: If you turn this off then a single shared connection is used for the producer, also if you are doing request/reply. That means there is a potential issue with interleaved responses if replies comes back out-of-order. Therefore you need to have a correlation id in both the request and reply messages so you can properly correlate the replies to the Camel callback that is responsible for continue processing the message in Camel. To do this you need to implement NettyCamelStateCorrelationManager as correlation manager and configure it via the correlationManager option. See also the correlationManager option for more details.

true

boolean

producerPoolMaxIdle (producer (advanced))

Sets the cap on the number of idle instances in the pool.

100

int

producerPoolMaxTotal (producer (advanced))

Sets the cap on the number of objects that can be allocated by the pool (checked out to clients, or idle awaiting checkout) at a given time. Use a negative value for no limit. Be careful to not set this value too low (such as 1) as the pool must have space to create a producer such as when performing retries. Be mindful that the option producerPoolBlockWhenExhausted is default true, and the pool will then block when there is no space, which can lead to the application to hang.

-1

int

producerPoolMaxWait (producer (advanced))

Sets the maximum duration (value in millis) the borrowObject() method should block before throwing an exception when the pool is exhausted and producerPoolBlockWhenExhausted is true. When less than 0, the borrowObject() method may block indefinitely.

-1

long

producerPoolMinEvictableIdle (producer (advanced))

Sets the minimum amount of time (value in millis) an object may sit idle in the pool before it is eligible for eviction by the idle object evictor.

300000

long

producerPoolMinIdle (producer (advanced))

Sets the minimum number of instances allowed in the producer pool before the evictor thread (if active) spawns new objects.

int

udpConnectionlessSending (producer (advanced))

This option supports connection less udp sending which is a real fire and forget. A connected udp send receive the PortUnreachableException if no one is listen on the receiving port.

false

boolean

useByteBuf (producer (advanced))

If the useByteBuf is true, netty producer will turn the message body into ByteBuf before sending it out.

false

boolean

allowSerializedHeaders (advanced)

Only used for TCP when transferExchange is true. When set to true, serializable objects in headers and properties will be added to the exchange. Otherwise Camel will exclude any non-serializable objects and log it at WARN level.

false

boolean

autowiredEnabled (advanced)

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

boolean

channelGroup (advanced)

To use a explicit ChannelGroup.

ChannelGroup

headerFilterStrategy (advanced)

To use a custom org.apache.camel.spi.HeaderFilterStrategy to filter headers.

HeaderFilterStrategy

nativeTransport (advanced)

Whether to use native transport instead of NIO. Native transport takes advantage of the host operating system and is only supported on some platforms. You need to add the netty JAR for the host operating system you are using. See more details at: http://netty.io/wiki/native-transports.html.

false

boolean

nettyHttpBinding (advanced)

To use a custom org.apache.camel.component.netty.http.NettyHttpBinding for binding to/from Netty and Camel Message API.

NettyHttpBinding

options (advanced)

Allows to configure additional netty options using option. as prefix. For example option.child.keepAlive=false to set the netty option child.keepAlive=false. See the Netty documentation for possible options that can be used.

Map

receiveBufferSize (advanced)

The TCP/UDP buffer sizes to be used during inbound communication. Size is bytes.

65536

int

receiveBufferSizePredictor (advanced)

Configures the buffer size predictor. See details at Jetty documentation and this mail thread.

int

sendBufferSize (advanced)

The TCP/UDP buffer sizes to be used during outbound communication. Size is bytes.

65536

int

transferExchange (advanced)

Only used for TCP. You can transfer the exchange over the wire instead of just the body. The following fields are transferred: In body, Out body, fault body, In headers, Out headers, fault headers, exchange properties, exchange exception. This requires that the objects are serializable. Camel will exclude any non-serializable objects and log it at WARN level.

false

boolean

udpByteArrayCodec (advanced)

For UDP only. If enabled the using byte array codec instead of Java serialization protocol.

false

boolean

unixDomainSocketPath (advanced)

Path to unix domain socket to use instead of inet socket. Host and port parameters will not be used, however required. It is ok to set dummy values for them. Must be used with nativeTransport=true and clientMode=false.

String

workerCount (advanced)

When netty works on nio mode, it uses default workerCount parameter from Netty (which is cpu_core_threads x 2). User can use this option to override the default workerCount from Netty.

int

workerGroup (advanced)

To use a explicit EventLoopGroup as the boss thread pool. For example to share a thread pool with multiple consumers or producers. By default each consumer or producer has their own worker pool with 2 x cpu count core threads.

EventLoopGroup

allowDefaultCodec (codec)

The netty component installs a default codec if both, encoder/decoder is null and textline is false. Setting allowDefaultCodec to false prevents the netty component from installing a default codec as the first element in the filter chain.

true

boolean

autoAppendDelimiter (codec)

Whether or not to auto append missing end delimiter when sending using the textline codec.

true

boolean

decoderMaxLineLength (codec)

The max line length to use for the textline codec.

1024

int

decoders (codec)

A list of decoders to be used. You can use a String which have values separated by comma, and have the values be looked up in the Registry. Just remember to prefix the value with # so Camel knows it should lookup.

String

delimiter (codec)

The delimiter to use for the textline codec. Possible values are LINE and NULL.

Enum values:

  • LINE

  • NULL

LINE

TextLineDelimiter

encoders (codec)

A list of encoders to be used. You can use a String which have values separated by comma, and have the values be looked up in the Registry. Just remember to prefix the value with # so Camel knows it should lookup.

String

encoding (codec)

The encoding (a charset name) to use for the textline codec. If not provided, Camel will use the JVM default Charset.

String

textline (codec)

Only used for TCP. If no codec is specified, you can use this flag to indicate a text line based codec; if not specified or the value is false, then Object Serialization is assumed over TCP - however only Strings are allowed to be serialized by default.

false

boolean

enabledProtocols (security)

Which protocols to enable when using SSL.

TLSv1.2,TLSv1.3

String

hostnameVerification (security)

To enable/disable hostname verification on SSLEngine.

false

boolean

keyStoreFile (security)

Client side certificate keystore to be used for encryption.

File

keyStoreFormat (security)

Keystore format to be used for payload encryption. Defaults to JKS if not set.

String

keyStoreResource (security)

Client side certificate keystore to be used for encryption. Is loaded by default from classpath, but you can prefix with classpath:, file:, or http: to load the resource from different systems.

String

needClientAuth (security)

Configures whether the server needs client authentication when using SSL.

false

boolean

passphrase (security)

Password setting to use in order to encrypt/decrypt payloads sent using SSH.

String

securityConfiguration (security)

Refers to a org.apache.camel.component.netty.http.NettyHttpSecurityConfiguration for configuring secure web resources.

NettyHttpSecurityConfiguration

securityProvider (security)

Security provider to be used for payload encryption. Defaults to SunX509 if not set.

String

ssl (security)

Setting to specify whether SSL encryption is applied to this endpoint.

false

boolean

sslClientCertHeaders (security)

When enabled and in SSL mode, then the Netty consumer will enrich the Camel Message with headers having information about the client certificate such as subject name, issuer name, serial number, and the valid date range.

false

boolean

sslContextParameters (security)

To configure security using SSLContextParameters.

SSLContextParameters

sslHandler (security)

Reference to a class that could be used to return an SSL Handler.

SslHandler

trustStoreFile (security)

Server side certificate keystore to be used for encryption.

File

trustStoreResource (security)

Server side certificate keystore to be used for encryption. Is loaded by default from classpath, but you can prefix with classpath:, file:, or http: to load the resource from different systems.

String

useGlobalSslContextParameters (security)

Enable usage of global SSL context parameters.

false

boolean

Endpoint Options

The Netty HTTP endpoint is configured using URI syntax:

netty-http:protocol://host:port/path

With the following path and query parameters:

Path Parameters (4 parameters)

Name Description Default Type

protocol (common)

Required The protocol to use which is either http, https or proxy (consumer only).

Enum values:

  • http

  • https

  • proxy

String

host (common)

Required The local hostname such as localhost, or 0.0.0.0 when being a consumer. The remote HTTP server hostname when using producer.

String

port (common)

The host port number.

int

path (common)

Resource path.

String

Query Parameters (85 parameters)

Name Description Default Type

bridgeEndpoint (common)

If the option is true, the producer will ignore the NettyHttpConstants.HTTP_URI header, and use the endpoint’s URI for request. You may also set the throwExceptionOnFailure to be false to let the producer send all the fault response back. The consumer working in the bridge mode will skip the gzip compression and WWW URL form encoding (by adding the Exchange.SKIP_GZIP_ENCODING and Exchange.SKIP_WWW_FORM_URLENCODED headers to the consumed exchange).

false

boolean

disconnect (common)

Whether or not to disconnect(close) from Netty Channel right after use. Can be used for both consumer and producer.

false

boolean

keepAlive (common)

Setting to ensure socket is not closed due to inactivity.

true

boolean

reuseAddress (common)

Setting to facilitate socket multiplexing.

true

boolean

reuseChannel (common)

This option allows producers and consumers (in client mode) to reuse the same Netty Channel for the lifecycle of processing the Exchange. This is useful if you need to call a server multiple times in a Camel route and want to use the same network connection. When using this, the channel is not returned to the connection pool until the Exchange is done; or disconnected if the disconnect option is set to true. The reused Channel is stored on the Exchange as an exchange property with the key NettyConstants#NETTY_CHANNEL which allows you to obtain the channel during routing and use it as well.

false

boolean

sync (common)

Setting to set endpoint as one-way or request-response.

true

boolean

tcpNoDelay (common)

Setting to improve TCP protocol performance.

true

boolean

matchOnUriPrefix (consumer)

Whether or not Camel should try to find a target consumer by matching the URI prefix if no exact match is found.

false

boolean

muteException (consumer)

If enabled and an Exchange failed processing on the consumer side the response’s body won’t contain the exception’s stack trace.

false

boolean

send503whenSuspended (consumer)

Whether to send back HTTP status code 503 when the consumer has been suspended. If the option is false then the Netty Acceptor is unbound when the consumer is suspended, so clients cannot connect anymore.

true

boolean

backlog (consumer (advanced))

Allows to configure a backlog for netty consumer (server). Note the backlog is just a best effort depending on the OS. Setting this option to a value such as 200, 500 or 1000, tells the TCP stack how long the accept queue can be If this option is not configured, then the backlog depends on OS setting.

int

bossCount (consumer (advanced))

When netty works on nio mode, it uses default bossCount parameter from Netty, which is 1. User can use this option to override the default bossCount from Netty.

1

int

bossGroup (consumer (advanced))

Set the BossGroup which could be used for handling the new connection of the server side across the NettyEndpoint.

EventLoopGroup

bridgeErrorHandler (consumer (advanced))

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions (if possible) occurred while the Camel consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. Important: This is only possible if the 3rd party component allows Camel to be alerted if an exception was thrown. Some components handle this internally only, and therefore bridgeErrorHandler is not possible. In other situations we may improve the Camel component to hook into the 3rd party component and make this possible for future releases. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

boolean

chunkedMaxContentLength (consumer (advanced))

Value in bytes the max content length per chunked frame received on the Netty HTTP server.

1048576

int

compression (consumer (advanced))

Allow using gzip/deflate for compression on the Netty HTTP server if the client supports it from the HTTP headers.

false

boolean

disconnectOnNoReply (consumer (advanced))

If sync is enabled then this option dictates NettyConsumer if it should disconnect where there is no reply to send back.

true

boolean

exceptionHandler (consumer (advanced))

To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored.

ExceptionHandler

exchangePattern (consumer (advanced))

Sets the exchange pattern when the consumer creates an exchange.

Enum values:

  • InOnly

  • InOut

ExchangePattern

httpMethodRestrict (consumer (advanced))

To disable HTTP methods on the Netty HTTP consumer. You can specify multiple separated by comma.

String

logWarnOnBadRequest (consumer (advanced))

Whether Netty HTTP server should log a WARN if decoding the HTTP request failed and a HTTP Status 400 (bad request) is returned.

true

boolean

mapHeaders (consumer (advanced))

If this option is enabled, then during binding from Netty to Camel Message then the headers will be mapped as well (eg added as header to the Camel Message as well). You can turn off this option to disable this. The headers can still be accessed from the org.apache.camel.component.netty.http.NettyHttpMessage message with the method getHttpRequest() that returns the Netty HTTP request io.netty.handler.codec.http.HttpRequest instance.

true

boolean

maxChunkSize (consumer (advanced))

The maximum length of the content or each chunk. If the content length (or the length of each chunk) exceeds this value, the content or chunk will be split into multiple io.netty.handler.codec.http.HttpContents whose length is maxChunkSize at maximum. See io.netty.handler.codec.http.HttpObjectDecoder.

8192

int

maxHeaderSize (consumer (advanced))

The maximum length of all headers. If the sum of the length of each header exceeds this value, a io.netty.handler.codec.TooLongFrameException will be raised.

8192

int

maxInitialLineLength (consumer (advanced))

The maximum length of the initial line (e.g. \{code GET / HTTP/1.0} or \{code HTTP/1.0 200 OK}) If the length of the initial line exceeds this value, a TooLongFrameException will be raised. See io.netty.handler.codec.http.HttpObjectDecoder.

4096

int

nettyServerBootstrapFactory (consumer (advanced))

To use a custom NettyServerBootstrapFactory.

NettyServerBootstrapFactory

nettySharedHttpServer (consumer (advanced))

To use a shared Netty HTTP server. See Netty HTTP Server Example for more details.

NettySharedHttpServer

noReplyLogLevel (consumer (advanced))

If sync is enabled this option dictates NettyConsumer which logging level to use when logging a there is no reply to send back.

Enum values:

  • TRACE

  • DEBUG

  • INFO

  • WARN

  • ERROR

  • OFF

WARN

LoggingLevel

serverClosedChannelExceptionCaughtLogLevel (consumer (advanced))

If the server (NettyConsumer) catches an java.nio.channels.ClosedChannelException then its logged using this logging level. This is used to avoid logging the closed channel exceptions, as clients can disconnect abruptly and then cause a flood of closed exceptions in the Netty server.

Enum values:

  • TRACE

  • DEBUG

  • INFO

  • WARN

  • ERROR

  • OFF

DEBUG

LoggingLevel

serverExceptionCaughtLogLevel (consumer (advanced))

If the server (NettyConsumer) catches an exception then its logged using this logging level.

Enum values:

  • TRACE

  • DEBUG

  • INFO

  • WARN

  • ERROR

  • OFF

WARN

LoggingLevel

serverInitializerFactory (consumer (advanced))

To use a custom ServerInitializerFactory.

ServerInitializerFactory

traceEnabled (consumer (advanced))

Specifies whether to enable HTTP TRACE for this Netty HTTP consumer. By default TRACE is turned off.

false

boolean

urlDecodeHeaders (consumer (advanced))

If this option is enabled, then during binding from Netty to Camel Message then the header values will be URL decoded (eg %20 will be a space character. Notice this option is used by the default org.apache.camel.component.netty.http.NettyHttpBinding and therefore if you implement a custom org.apache.camel.component.netty.http.NettyHttpBinding then you would need to decode the headers accordingly to this option.

false

boolean

usingExecutorService (consumer (advanced))

Whether to use ordered thread pool, to ensure events are processed orderly on the same channel.

true

boolean

connectTimeout (producer)

Time to wait for a socket connection to be available. Value is in milliseconds.

10000

int

cookieHandler (producer)

Configure a cookie handler to maintain a HTTP session.

CookieHandler

requestTimeout (producer)

Allows to use a timeout for the Netty producer when calling a remote server. By default no timeout is in use. The value is in milli seconds, so eg 30000 is 30 seconds. The requestTimeout is using Netty’s ReadTimeoutHandler to trigger the timeout.

long

throwExceptionOnFailure (producer)

Option to disable throwing the HttpOperationFailedException in case of failed responses from the remote server. This allows you to get all responses regardless of the HTTP status code.

true

boolean

clientInitializerFactory (producer (advanced))

To use a custom ClientInitializerFactory.

ClientInitializerFactory

lazyChannelCreation (producer (advanced))

Channels can be lazily created to avoid exceptions, if the remote server is not up and running when the Camel producer is started.

true

boolean

lazyStartProducer (producer (advanced))

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

boolean

okStatusCodeRange (producer (advanced))

The status codes which are considered a success response. The values are inclusive. Multiple ranges can be defined, separated by comma, e.g. 200-204,209,301-304. Each range must be a single number or from-to with the dash included. The default range is 200-299.

200-299

String

producerPoolBlockWhenExhausted (producer (advanced))

Sets the value for the blockWhenExhausted configuration attribute. It determines whether to block when the borrowObject() method is invoked when the pool is exhausted (the maximum number of active objects has been reached).

true

boolean

producerPoolEnabled (producer (advanced))

Whether producer pool is enabled or not. Important: If you turn this off then a single shared connection is used for the producer, also if you are doing request/reply. That means there is a potential issue with interleaved responses if replies comes back out-of-order. Therefore you need to have a correlation id in both the request and reply messages so you can properly correlate the replies to the Camel callback that is responsible for continue processing the message in Camel. To do this you need to implement NettyCamelStateCorrelationManager as correlation manager and configure it via the correlationManager option. See also the correlationManager option for more details.

true

boolean

producerPoolMaxIdle (producer (advanced))

Sets the cap on the number of idle instances in the pool.

100

int

producerPoolMaxTotal (producer (advanced))

Sets the cap on the number of objects that can be allocated by the pool (checked out to clients, or idle awaiting checkout) at a given time. Use a negative value for no limit. Be careful to not set this value too low (such as 1) as the pool must have space to create a producer such as when performing retries. Be mindful that the option producerPoolBlockWhenExhausted is default true, and the pool will then block when there is no space, which can lead to the application to hang.

-1

int

producerPoolMaxWait (producer (advanced))

Sets the maximum duration (value in millis) the borrowObject() method should block before throwing an exception when the pool is exhausted and producerPoolBlockWhenExhausted is true. When less than 0, the borrowObject() method may block indefinitely.

-1

long

producerPoolMinEvictableIdle (producer (advanced))

Sets the minimum amount of time (value in millis) an object may sit idle in the pool before it is eligible for eviction by the idle object evictor.

300000

long

producerPoolMinIdle (producer (advanced))

Sets the minimum number of instances allowed in the producer pool before the evictor thread (if active) spawns new objects.

int

useRelativePath (producer (advanced))

Sets whether to use a relative path in HTTP requests.

true

boolean

allowSerializedHeaders (advanced)

Only used for TCP when transferExchange is true. When set to true, serializable objects in headers and properties will be added to the exchange. Otherwise Camel will exclude any non-serializable objects and log it at WARN level.

false

boolean

channelGroup (advanced)

To use a explicit ChannelGroup.

ChannelGroup

configuration (advanced)

To use a custom configured NettyHttpConfiguration for configuring this endpoint.

NettyHttpConfiguration

disableStreamCache (advanced)

Determines whether or not the raw input stream from Netty HttpRequest#getContent() or HttpResponset#getContent() is cached or not (Camel will read the stream into a in light-weight memory based Stream caching) cache. By default Camel will cache the Netty input stream to support reading it multiple times to ensure it Camel can retrieve all data from the stream. However you can set this option to true when you for example need to access the raw stream, such as streaming it directly to a file or other persistent store. Mind that if you enable this option, then you cannot read the Netty stream multiple times out of the box, and you would need manually to reset the reader index on the Netty raw stream. Also Netty will auto-close the Netty stream when the Netty HTTP server/HTTP client is done processing, which means that if the asynchronous routing engine is in use then any asynchronous thread that may continue routing the org.apache.camel.Exchange may not be able to read the Netty stream, because Netty has closed it.

false

boolean

headerFilterStrategy (advanced)

To use a custom org.apache.camel.spi.HeaderFilterStrategy to filter headers.

HeaderFilterStrategy

nativeTransport (advanced)

Whether to use native transport instead of NIO. Native transport takes advantage of the host operating system and is only supported on some platforms. You need to add the netty JAR for the host operating system you are using. See more details at: http://netty.io/wiki/native-transports.html.

false

boolean

nettyHttpBinding (advanced)

To use a custom org.apache.camel.component.netty.http.NettyHttpBinding for binding to/from Netty and Camel Message API.

NettyHttpBinding

options (advanced)

Allows to configure additional netty options using option. as prefix. For example option.child.keepAlive=false to set the netty option child.keepAlive=false. See the Netty documentation for possible options that can be used.

Map

receiveBufferSize (advanced)

The TCP/UDP buffer sizes to be used during inbound communication. Size is bytes.

65536

int

receiveBufferSizePredictor (advanced)

Configures the buffer size predictor. See details at Jetty documentation and this mail thread.

int

sendBufferSize (advanced)

The TCP/UDP buffer sizes to be used during outbound communication. Size is bytes.

65536

int

synchronous (advanced)

Sets whether synchronous processing should be strictly used.

false

boolean

transferException (advanced)

If enabled and an Exchange failed processing on the consumer side, and if the caused Exception was send back serialized in the response as a application/x-java-serialized-object content type. On the producer side the exception will be deserialized and thrown as is, instead of the HttpOperationFailedException. The caused exception is required to be serialized. This is by default turned off. If you enable this then be aware that Java will deserialize the incoming data from the request to Java and that can be a potential security risk.

false

boolean

transferExchange (advanced)

Only used for TCP. You can transfer the exchange over the wire instead of just the body. The following fields are transferred: In body, Out body, fault body, In headers, Out headers, fault headers, exchange properties, exchange exception. This requires that the objects are serializable. Camel will exclude any non-serializable objects and log it at WARN level.

false

boolean

unixDomainSocketPath (advanced)

Path to unix domain socket to use instead of inet socket. Host and port parameters will not be used, however required. It is ok to set dummy values for them. Must be used with nativeTransport=true and clientMode=false.

String

workerCount (advanced)

When netty works on nio mode, it uses default workerCount parameter from Netty (which is cpu_core_threads x 2). User can use this option to override the default workerCount from Netty.

int

workerGroup (advanced)

To use a explicit EventLoopGroup as the boss thread pool. For example to share a thread pool with multiple consumers or producers. By default each consumer or producer has their own worker pool with 2 x cpu count core threads.

EventLoopGroup

decoders (codec)

A list of decoders to be used. You can use a String which have values separated by comma, and have the values be looked up in the Registry. Just remember to prefix the value with # so Camel knows it should lookup.

String

encoders (codec)

A list of encoders to be used. You can use a String which have values separated by comma, and have the values be looked up in the Registry. Just remember to prefix the value with # so Camel knows it should lookup.

String

enabledProtocols (security)

Which protocols to enable when using SSL.

TLSv1.2,TLSv1.3

String

hostnameVerification (security)

To enable/disable hostname verification on SSLEngine.

false

boolean

keyStoreFile (security)

Client side certificate keystore to be used for encryption.

File

keyStoreFormat (security)

Keystore format to be used for payload encryption. Defaults to JKS if not set.

String

keyStoreResource (security)

Client side certificate keystore to be used for encryption. Is loaded by default from classpath, but you can prefix with classpath:, file:, or http: to load the resource from different systems.

String

needClientAuth (security)

Configures whether the server needs client authentication when using SSL.

false

boolean

passphrase (security)

Password setting to use in order to encrypt/decrypt payloads sent using SSH.

String

securityConfiguration (security)

Refers to a org.apache.camel.component.netty.http.NettyHttpSecurityConfiguration for configuring secure web resources.

NettyHttpSecurityConfiguration

securityOptions (security)

To configure NettyHttpSecurityConfiguration using key/value pairs from the map.

Map

securityProvider (security)

Security provider to be used for payload encryption. Defaults to SunX509 if not set.

String

ssl (security)

Setting to specify whether SSL encryption is applied to this endpoint.

false

boolean

sslClientCertHeaders (security)

When enabled and in SSL mode, then the Netty consumer will enrich the Camel Message with headers having information about the client certificate such as subject name, issuer name, serial number, and the valid date range.

false

boolean

sslContextParameters (security)

To configure security using SSLContextParameters.

SSLContextParameters

sslHandler (security)

Reference to a class that could be used to return an SSL Handler.

SslHandler

trustStoreFile (security)

Server side certificate keystore to be used for encryption.

File

trustStoreResource (security)

Server side certificate keystore to be used for encryption. Is loaded by default from classpath, but you can prefix with classpath:, file:, or http: to load the resource from different systems.

String

Message Headers

The Netty HTTP component supports 23 message header(s), which is/are listed below:

Name Description Default Type

CamelHttpAuthentication (common)

Constant: HTTP_AUTHENTICATION

If the user was authenticated using HTTP Basic then this header is added with the value Basic.

String

Content-Type (common)

Constant: CONTENT_TYPE

To set the content-type of the HTTP body. For example: text/plain; charset=UTF-8.

String

connection (common)

Constant: CONNECTION

The value of the HTTP header connection to use.

String

CamelNettyCloseChannelWhenComplete (common)

Constant: NETTY_CLOSE_CHANNEL_WHEN_COMPLETE

Indicates whether the channel should be closed after complete.

Boolean

CamelHttpResponseCode (common)

Constant: HTTP_RESPONSE_CODE

Allows to set the HTTP Status code to use. By default 200 is used for success, and 500 for failure.

Integer

CamelHttpProtocolVersion (common)

Constant: HTTP_PROTOCOL_VERSION

The version of the HTTP protocol.

HTTP/1.1

String

CamelHttpMethod (common)

Constant: HTTP_METHOD

The HTTP method used, such as GET, POST, TRACE etc.

GET

String

CamelHttpQuery (common)

Constant: HTTP_QUERY

Any query parameters, such as foo=bar&beer=yes.

String

CamelHttpPath (common)

Constant: HTTP_PATH

Allows to provide URI context-path and query parameters as a String value that overrides the endpoint configuration. This allows to reuse the same producer for calling same remote http server, but using a dynamic context-path and query parameters.

String

CamelHttpRawQuery (common)

Constant: HTTP_RAW_QUERY

Any query parameters, such as foo=bar&beer=yes. Stored in the raw form, as they arrived to the consumer (i.e. before URL decoding).

String

CamelHttpUrl (common)

Constant: HTTP_URL

The URL including protocol, host and port, etc: http://0.0.0.0:8080/myapp.

String

CamelHttpCharacterEncoding (common)

Constant: HTTP_CHARACTER_ENCODING

The charset from the content-type header.

String

CamelHttpUri (common)

Constant: HTTP_URI

The URI without protocol, host and port, etc: /myapp.

String

CamelNettyChannelHandlerContext (common)

Constant: NETTY_CHANNEL_HANDLER_CONTEXT

The channel handler context.

ChannelHandlerContext

CamelNettyRemoteAddress (common)

Constant: NETTY_REMOTE_ADDRESS

The remote address.

SocketAddress

CamelNettyLocalAddress (common)

Constant: NETTY_LOCAL_ADDRESS

The local address.

SocketAddress

CamelNettySSLSession (common)

Constant: NETTY_SSL_SESSION

The SSL session.

SSLSession

CamelNettySSLClientCertSubjectName (common)

Constant: NETTY_SSL_CLIENT_CERT_SUBJECT_NAME

The SSL client certificate subject name.

String

CamelNettySSLClientCertIssuerName (common)

Constant: NETTY_SSL_CLIENT_CERT_ISSUER_NAME

The SSL client certificate issuer name.

String

CamelNettySSLClientCertSerialNumber (common)

Constant: NETTY_SSL_CLIENT_CERT_SERIAL_NO

The SSL client certificate serial number.

String

CamelNettySSLClientCertNotBefore (common)

Constant: NETTY_SSL_CLIENT_CERT_NOT_BEFORE

The SSL client certificate not before.

Date

CamelNettySSLClientCertNotAfter (common)

Constant: NETTY_SSL_CLIENT_CERT_NOT_AFTER

The SSL client certificate not after.

Date

CamelNettyRequestTimeout (common)

Constant: NETTY_REQUEST_TIMEOUT

The read timeout.

Long

Usage

Access to Netty types

This component uses the org.apache.camel.component.netty.http.NettyHttpMessage as the message implementation on the Exchange. This allows end users to get access to the original Netty request/response instances if needed, as shown below. Mind that the original response may not be accessible at all times.

io.netty.handler.codec.http.HttpRequest request = exchange.getIn(NettyHttpMessage.class).getHttpRequest();

Using HTTP Basic Authentication

The Netty HTTP consumer supports HTTP basic authentication by specifying the security realm name to use, as shown below

<route>
   <from uri="netty-http:http://0.0.0.0:{{port}}/foo?securityConfiguration.realm=someRealm"/>
   ...
</route>

The realm name is mandatory to enable basic authentication. By default, the JAAS based authenticator is used, which will use the realm name specified (someRealm in the example above) and use the JAAS realm and the JAAS \{{LoginModule}}s of this realm for authentication.

Specifying ACL on web resources

The org.apache.camel.component.netty.http.SecurityConstraint allows to define constraints on web resources. And the org.apache.camel.component.netty.http.SecurityConstraintMapping is provided out of the box, allowing to easily define inclusions and exclusions with roles.

For example, as shown below in the XML DSL, we define the constraint bean:

  <bean id="constraint" class="org.apache.camel.component.netty.http.SecurityConstraintMapping">
    <!-- inclusions defines url -> roles restrictions -->
    <!-- a * should be used for any role accepted (or even no roles) -->
    <property name="inclusions">
      <map>
        <entry key="/*" value="*"/>
        <entry key="/admin/*" value="admin"/>
        <entry key="/guest/*" value="admin,guest"/>
      </map>
    </property>
    <!-- exclusions is used to define public urls, which requires no authentication -->
    <property name="exclusions">
      <set>
        <value>/public/*</value>
      </set>
    </property>
  </bean>

The constraint above is defined so that

  • access to /* is restricted and any roles are accepted (also if user has no roles)

  • access to /admin/* requires the admin role

  • access to /guest/* requires the admin or guest role

  • access to /public/* is an exclusion that means no authentication is necessary, and is therefore public for everyone without logging in

To use this constraint, we just need to refer to the bean id as shown below:

<route>
   <from uri="netty-http:http://0.0.0.0:{{port}}/foo?matchOnUriPrefix=true&amp;securityConfiguration.realm=someRealm&amp;securityConfiguration.securityConstraint=#constraint"/>
   ...
</route>

Examples

In the route below, we use Netty HTTP as an HTTP server, which returns a hardcoded "Bye World" message.

    from("netty-http:http://0.0.0.0:8080/foo")
      .transform().constant("Bye World");

And we can call this HTTP server using Camel also, with the ProducerTemplate as shown below:

    String out = template.requestBody("netty-http:http://0.0.0.0:8080/foo", "Hello World", String.class);
    System.out.println(out);

And we get "Bye World" as the output.

How do I let Netty match wildcards?

By default, Netty HTTP will only match on exact uri’s. But you can instruct Netty to match prefixes. For example

from("netty-http:http://0.0.0.0:8123/foo").to("mock:foo");

In the route above Netty HTTP will only match if the uri is an exact match, so it will match if you enter
http://0.0.0.0:8123/foo but not match if you do http://0.0.0.0:8123/foo/bar.

So if you want to enable wildcard matching, you do as follows:

from("netty-http:http://0.0.0.0:8123/foo?matchOnUriPrefix=true").to("mock:foo");

So now Netty matches any endpoints with starts with foo.

To match any endpoint, you can do:

from("netty-http:http://0.0.0.0:8123?matchOnUriPrefix=true").to("mock:foo");

Using multiple routes with same port

In the same CamelContext you can have multiple routes from Netty HTTP that shares the same port (e.g., a io.netty.bootstrap.ServerBootstrap instance). Doing this requires a number of bootstrap options to be identical in the routes, as the routes will share the same io.netty.bootstrap.ServerBootstrap instance. The instance will be configured with the options from the first route created.

The options the routes must be identical configured is all the options defined in the org.apache.camel.component.netty.NettyServerBootstrapConfiguration configuration class. If you have configured another route with different options, Camel will throw an exception on startup, indicating the options are not identical. To mitigate this ensure all options are identical.

Here is an example with two routes that share the same port.

Two routes sharing the same port

from("netty-http:http://0.0.0.0:{{port}}/foo")
  .to("mock:foo")
  .transform().constant("Bye World");

from("netty-http:http://0.0.0.0:{{port}}/bar")
  .to("mock:bar")
  .transform().constant("Bye Camel");

And here is an example of a mis-configured second route that does not have identical org.apache.camel.component.netty.NettyServerBootstrapConfiguration option as the first route. This will cause Camel to fail on startup.

Two routes are sharing the same port, but the second route is misconfigured and will fail on starting

from("netty-http:http://0.0.0.0:{{port}}/foo")
  .to("mock:foo")
  .transform().constant("Bye World");

// we cannot have a 2nd route on the same port with SSL enabled, when the 1st route is NOT
from("netty-http:http://0.0.0.0:{{port}}/bar?ssl=true")
  .to("mock:bar")
  .transform().constant("Bye Camel");

Reusing the same server bootstrap configuration with multiple routes

By configuring the common server bootstrap option in a single instance of a org.apache.camel.component.netty.NettyServerBootstrapConfiguration type, we can use the bootstrapConfiguration option on the Netty HTTP consumers to refer and reuse the same options across all consumers.

<bean id="nettyHttpBootstrapOptions" class="org.apache.camel.component.netty.NettyServerBootstrapConfiguration">
  <property name="backlog" value="200"/>
  <property name="connectionTimeout" value="20000"/>
  <property name="workerCount" value="16"/>
</bean>

And in the routes you refer to this option as shown below

<route>
  <from uri="netty-http:http://0.0.0.0:{{port}}/foo?bootstrapConfiguration=#nettyHttpBootstrapOptions"/>
  ...
</route>

<route>
  <from uri="netty-http:http://0.0.0.0:{{port}}/bar?bootstrapConfiguration=#nettyHttpBootstrapOptions"/>
  ...
</route>

<route>
  <from uri="netty-http:http://0.0.0.0:{{port}}/beer?bootstrapConfiguration=#nettyHttpBootstrapOptions"/>
  ...
</route>

Implementing a reverse proxy

Netty HTTP component can act as a reverse proxy, in that case Exchange.HTTP_SCHEME, Exchange.HTTP_HOST and Exchange.HTTP_PORT headers are populated from the absolute URL received on the request line of the HTTP request.

Here’s an example of an HTTP proxy that simply transforms the response from the origin server to uppercase.

from("netty-http:proxy://0.0.0.0:8080")
    .toD("netty-http:"
        + "${headers." + Exchange.HTTP_SCHEME + "}://"
        + "${headers." + Exchange.HTTP_HOST + "}:"
        + "${headers." + Exchange.HTTP_PORT + "}")
    .process(this::processResponse);

void processResponse(final Exchange exchange) {
    final NettyHttpMessage message = exchange.getIn(NettyHttpMessage.class);
    final FullHttpResponse response = message.getHttpResponse();

    final ByteBuf buf = response.content();
    final String string = buf.toString(StandardCharsets.UTF_8);

    buf.resetWriterIndex();
    ByteBufUtil.writeUtf8(buf, string.toUpperCase(Locale.US));
}

Spring Boot Auto-Configuration

When using netty-http with Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

<dependency>
  <groupId>org.apache.camel.springboot</groupId>
  <artifactId>camel-netty-http-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 67 options, which are listed below.

Name Description Default Type

camel.component.netty-http.allow-serialized-headers

Only used for TCP when transferExchange is true. When set to true, serializable objects in headers and properties will be added to the exchange. Otherwise Camel will exclude any non-serializable objects and log it at WARN level.

false

Boolean

camel.component.netty-http.autowired-enabled

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

Boolean

camel.component.netty-http.backlog

Allows to configure a backlog for netty consumer (server). Note the backlog is just a best effort depending on the OS. Setting this option to a value such as 200, 500 or 1000, tells the TCP stack how long the accept queue can be If this option is not configured, then the backlog depends on OS setting.

Integer

camel.component.netty-http.boss-count

When netty works on nio mode, it uses default bossCount parameter from Netty, which is 1. User can use this option to override the default bossCount from Netty.

1

Integer

camel.component.netty-http.boss-group

Set the BossGroup which could be used for handling the new connection of the server side across the NettyEndpoint. The option is a io.netty.channel.EventLoopGroup type.

EventLoopGroup

camel.component.netty-http.bridge-error-handler

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions (if possible) occurred while the Camel consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. Important: This is only possible if the 3rd party component allows Camel to be alerted if an exception was thrown. Some components handle this internally only, and therefore bridgeErrorHandler is not possible. In other situations we may improve the Camel component to hook into the 3rd party component and make this possible for future releases. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

Boolean

camel.component.netty-http.channel-group

To use a explicit ChannelGroup. The option is a io.netty.channel.group.ChannelGroup type.

ChannelGroup

camel.component.netty-http.client-initializer-factory

To use a custom ClientInitializerFactory. The option is a org.apache.camel.component.netty.ClientInitializerFactory type.

ClientInitializerFactory

camel.component.netty-http.configuration

To use the NettyConfiguration as configuration when creating endpoints. The option is a org.apache.camel.component.netty.NettyConfiguration type.

NettyConfiguration

camel.component.netty-http.connect-timeout

Time to wait for a socket connection to be available. Value is in milliseconds.

10000

Integer

camel.component.netty-http.correlation-manager

To use a custom correlation manager to manage how request and reply messages are mapped when using request/reply with the netty producer. This should only be used if you have a way to map requests together with replies such as if there is correlation ids in both the request and reply messages. This can be used if you want to multiplex concurrent messages on the same channel (aka connection) in netty. When doing this you must have a way to correlate the request and reply messages so you can store the right reply on the inflight Camel Exchange before its continued routed. We recommend extending the TimeoutCorrelationManagerSupport when you build custom correlation managers. This provides support for timeout and other complexities you otherwise would need to implement as well. See also the producerPoolEnabled option for more details. The option is a org.apache.camel.component.netty.NettyCamelStateCorrelationManager type.

NettyCamelStateCorrelationManager

camel.component.netty-http.decoders

A list of decoders to be used. You can use a String which have values separated by comma, and have the values be looked up in the Registry. Just remember to prefix the value with # so Camel knows it should lookup.

String

camel.component.netty-http.disconnect

Whether or not to disconnect(close) from Netty Channel right after use. Can be used for both consumer and producer.

false

Boolean

camel.component.netty-http.disconnect-on-no-reply

If sync is enabled then this option dictates NettyConsumer if it should disconnect where there is no reply to send back.

true

Boolean

camel.component.netty-http.enabled

Whether to enable auto configuration of the netty-http component. This is enabled by default.

Boolean

camel.component.netty-http.enabled-protocols

Which protocols to enable when using SSL.

TLSv1.2,TLSv1.3

String

camel.component.netty-http.encoders

A list of encoders to be used. You can use a String which have values separated by comma, and have the values be looked up in the Registry. Just remember to prefix the value with # so Camel knows it should lookup.

String

camel.component.netty-http.executor-service

To use the given EventExecutorGroup. The option is a io.netty.util.concurrent.EventExecutorGroup type.

EventExecutorGroup

camel.component.netty-http.header-filter-strategy

To use a custom org.apache.camel.spi.HeaderFilterStrategy to filter headers. The option is a org.apache.camel.spi.HeaderFilterStrategy type.

HeaderFilterStrategy

camel.component.netty-http.hostname-verification

To enable/disable hostname verification on SSLEngine.

false

Boolean

camel.component.netty-http.keep-alive

Setting to ensure socket is not closed due to inactivity.

true

Boolean

camel.component.netty-http.key-store-file

Client side certificate keystore to be used for encryption.

File

camel.component.netty-http.key-store-format

Keystore format to be used for payload encryption. Defaults to JKS if not set.

String

camel.component.netty-http.key-store-resource

Client side certificate keystore to be used for encryption. Is loaded by default from classpath, but you can prefix with classpath:, file:, or http: to load the resource from different systems.

String

camel.component.netty-http.lazy-channel-creation

Channels can be lazily created to avoid exceptions, if the remote server is not up and running when the Camel producer is started.

true

Boolean

camel.component.netty-http.lazy-start-producer

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

Boolean

camel.component.netty-http.maximum-pool-size

Sets a maximum thread pool size for the netty consumer ordered thread pool. The default size is 2 x cpu_core plus 1. Setting this value to eg 10 will then use 10 threads unless 2 x cpu_core plus 1 is a higher value, which then will override and be used. For example if there are 8 cores, then the consumer thread pool will be 17. This thread pool is used to route messages received from Netty by Camel. We use a separate thread pool to ensure ordering of messages and also in case some messages will block, then nettys worker threads (event loop) wont be affected.

Integer

camel.component.netty-http.mute-exception

If enabled and an Exchange failed processing on the consumer side the response’s body won’t contain the exception’s stack trace.

false

Boolean

camel.component.netty-http.native-transport

Whether to use native transport instead of NIO. Native transport takes advantage of the host operating system and is only supported on some platforms. You need to add the netty JAR for the host operating system you are using. See more details at: http://netty.io/wiki/native-transports.html.

false

Boolean

camel.component.netty-http.need-client-auth

Configures whether the server needs client authentication when using SSL.

false

Boolean

camel.component.netty-http.netty-http-binding

To use a custom org.apache.camel.component.netty.http.NettyHttpBinding for binding to/from Netty and Camel Message API. The option is a org.apache.camel.component.netty.http.NettyHttpBinding type.

NettyHttpBinding

camel.component.netty-http.netty-server-bootstrap-factory

To use a custom NettyServerBootstrapFactory. The option is a org.apache.camel.component.netty.NettyServerBootstrapFactory type.

NettyServerBootstrapFactory

camel.component.netty-http.no-reply-log-level

If sync is enabled this option dictates NettyConsumer which logging level to use when logging a there is no reply to send back.

warn

LoggingLevel

camel.component.netty-http.options

Allows to configure additional netty options using option. as prefix. For example option.child.keepAlive=false to set the netty option child.keepAlive=false. See the Netty documentation for possible options that can be used.

Map

camel.component.netty-http.passphrase

Password setting to use in order to encrypt/decrypt payloads sent using SSH.

String

camel.component.netty-http.producer-pool-block-when-exhausted

Sets the value for the blockWhenExhausted configuration attribute. It determines whether to block when the borrowObject() method is invoked when the pool is exhausted (the maximum number of active objects has been reached).

true

Boolean

camel.component.netty-http.producer-pool-enabled

Whether producer pool is enabled or not. Important: If you turn this off then a single shared connection is used for the producer, also if you are doing request/reply. That means there is a potential issue with interleaved responses if replies comes back out-of-order. Therefore you need to have a correlation id in both the request and reply messages so you can properly correlate the replies to the Camel callback that is responsible for continue processing the message in Camel. To do this you need to implement NettyCamelStateCorrelationManager as correlation manager and configure it via the correlationManager option. See also the correlationManager option for more details.

true

Boolean

camel.component.netty-http.producer-pool-max-idle

Sets the cap on the number of idle instances in the pool.

100

Integer

camel.component.netty-http.producer-pool-max-total

Sets the cap on the number of objects that can be allocated by the pool (checked out to clients, or idle awaiting checkout) at a given time. Use a negative value for no limit. Be careful to not set this value too low (such as 1) as the pool must have space to create a producer such as when performing retries. Be mindful that the option producerPoolBlockWhenExhausted is default true, and the pool will then block when there is no space, which can lead to the application to hang.

-1

Integer

camel.component.netty-http.producer-pool-max-wait

Sets the maximum duration (value in millis) the borrowObject() method should block before throwing an exception when the pool is exhausted and producerPoolBlockWhenExhausted is true. When less than 0, the borrowObject() method may block indefinitely.

-1

Long

camel.component.netty-http.producer-pool-min-evictable-idle

Sets the minimum amount of time (value in millis) an object may sit idle in the pool before it is eligible for eviction by the idle object evictor.

300000

Long

camel.component.netty-http.producer-pool-min-idle

Sets the minimum number of instances allowed in the producer pool before the evictor thread (if active) spawns new objects.

Integer

camel.component.netty-http.receive-buffer-size

The TCP/UDP buffer sizes to be used during inbound communication. Size is bytes.

65536

Integer

camel.component.netty-http.receive-buffer-size-predictor

Configures the buffer size predictor. See details at Jetty documentation and this mail thread.

Integer

camel.component.netty-http.request-timeout

Allows to use a timeout for the Netty producer when calling a remote server. By default no timeout is in use. The value is in milli seconds, so eg 30000 is 30 seconds. The requestTimeout is using Netty’s ReadTimeoutHandler to trigger the timeout.

Long

camel.component.netty-http.reuse-address

Setting to facilitate socket multiplexing.

true

Boolean

camel.component.netty-http.reuse-channel

This option allows producers and consumers (in client mode) to reuse the same Netty Channel for the lifecycle of processing the Exchange. This is useful if you need to call a server multiple times in a Camel route and want to use the same network connection. When using this, the channel is not returned to the connection pool until the Exchange is done; or disconnected if the disconnect option is set to true. The reused Channel is stored on the Exchange as an exchange property with the key NettyConstants#NETTY_CHANNEL which allows you to obtain the channel during routing and use it as well.

false

Boolean

camel.component.netty-http.security-configuration

Refers to a org.apache.camel.component.netty.http.NettyHttpSecurityConfiguration for configuring secure web resources. The option is a org.apache.camel.component.netty.http.NettyHttpSecurityConfiguration type.

NettyHttpSecurityConfiguration

camel.component.netty-http.security-provider

Security provider to be used for payload encryption. Defaults to SunX509 if not set.

String

camel.component.netty-http.send-buffer-size

The TCP/UDP buffer sizes to be used during outbound communication. Size is bytes.

65536

Integer

camel.component.netty-http.server-closed-channel-exception-caught-log-level

If the server (NettyConsumer) catches an java.nio.channels.ClosedChannelException then its logged using this logging level. This is used to avoid logging the closed channel exceptions, as clients can disconnect abruptly and then cause a flood of closed exceptions in the Netty server.

debug

LoggingLevel

camel.component.netty-http.server-exception-caught-log-level

If the server (NettyConsumer) catches an exception then its logged using this logging level.

warn

LoggingLevel

camel.component.netty-http.server-initializer-factory

To use a custom ServerInitializerFactory. The option is a org.apache.camel.component.netty.ServerInitializerFactory type.

ServerInitializerFactory

camel.component.netty-http.ssl

Setting to specify whether SSL encryption is applied to this endpoint.

false

Boolean

camel.component.netty-http.ssl-client-cert-headers

When enabled and in SSL mode, then the Netty consumer will enrich the Camel Message with headers having information about the client certificate such as subject name, issuer name, serial number, and the valid date range.

false

Boolean

camel.component.netty-http.ssl-context-parameters

To configure security using SSLContextParameters. The option is a org.apache.camel.support.jsse.SSLContextParameters type.

SSLContextParameters

camel.component.netty-http.ssl-handler

Reference to a class that could be used to return an SSL Handler. The option is a io.netty.handler.ssl.SslHandler type.

SslHandler

camel.component.netty-http.sync

Setting to set endpoint as one-way or request-response.

true

Boolean

camel.component.netty-http.tcp-no-delay

Setting to improve TCP protocol performance.

true

Boolean

camel.component.netty-http.transfer-exchange

Only used for TCP. You can transfer the exchange over the wire instead of just the body. The following fields are transferred: In body, Out body, fault body, In headers, Out headers, fault headers, exchange properties, exchange exception. This requires that the objects are serializable. Camel will exclude any non-serializable objects and log it at WARN level.

false

Boolean

camel.component.netty-http.trust-store-file

Server side certificate keystore to be used for encryption.

File

camel.component.netty-http.trust-store-resource

Server side certificate keystore to be used for encryption. Is loaded by default from classpath, but you can prefix with classpath:, file:, or http: to load the resource from different systems.

String

camel.component.netty-http.unix-domain-socket-path

Path to unix domain socket to use instead of inet socket. Host and port parameters will not be used, however required. It is ok to set dummy values for them. Must be used with nativeTransport=true and clientMode=false.

String

camel.component.netty-http.use-global-ssl-context-parameters

Enable usage of global SSL context parameters.

false

Boolean

camel.component.netty-http.using-executor-service

Whether to use ordered thread pool, to ensure events are processed orderly on the same channel.

true

Boolean

camel.component.netty-http.worker-count

When netty works on nio mode, it uses default workerCount parameter from Netty (which is cpu_core_threads x 2). User can use this option to override the default workerCount from Netty.

Integer

camel.component.netty-http.worker-group

To use a explicit EventLoopGroup as the boss thread pool. For example to share a thread pool with multiple consumers or producers. By default each consumer or producer has their own worker pool with 2 x cpu count core threads. The option is a io.netty.channel.EventLoopGroup type.

EventLoopGroup
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