[[netty4-http-component]]
== Netty4 HTTP Component

*Available as of Camel version 2.14*

The *netty4-http* component is an extension to <<netty4-component,Netty4>>
component to facilitiate HTTP transport with <<netty4-component,Netty4>>.

This camel component supports both producer and consumer endpoints.


INFO: *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. 
Notice Netty4 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 which is readable once.

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

[source,xml]
------------------------------------------------------------
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-netty4-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

[source,java]
-------------------------------------------
netty4-http:http://0.0.0.0:8080[?options]
-------------------------------------------

You can append query options to the URI in the following format,
`?option=value&option=value&...`


INFO: *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 -
`netty4-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).

### HTTP Options


INFO: *A lot more options*. *Important:* This component inherits all the options from
<<netty4-component,Netty4>>. So make sure to look at
the <<netty4-component,Netty4>> documentation as well. +
 Notice that some options from <<netty4-component,Netty4>> is not
applicable when using this Netty4 HTTP component, such as options
related to UDP transport.





// component options: START
The Netty4 HTTP component supports 9 options, which are listed below.



[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *nettyHttpBinding* (advanced) | To use a custom org.apache.camel.component.netty4.http.NettyHttpBinding for binding to/from Netty and Camel Message API. |  | NettyHttpBinding
| *configuration* (common) | To use the NettyConfiguration as configuration when creating endpoints. |  | NettyHttpConfiguration
| *headerFilterStrategy* (advanced) | To use a custom org.apache.camel.spi.HeaderFilterStrategy to filter headers. |  | HeaderFilterStrategy
| *securityConfiguration* (security) | Refers to a org.apache.camel.component.netty4.http.NettyHttpSecurityConfiguration for configuring secure web resources. |  | NettyHttpSecurity Configuration
| *useGlobalSslContext Parameters* (security) | Enable usage of global SSL context parameters. | false | boolean
| *maximumPoolSize* (advanced) | The thread pool size for the EventExecutorGroup if its in use. The default value is 16. | 16 | int
| *executorService* (advanced) | To use the given EventExecutorGroup. |  | EventExecutorGroup
| *sslContextParameters* (security) | To configure security using SSLContextParameters |  | SSLContextParameters
| *resolveProperty Placeholders* (advanced) | Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders. | true | boolean
|===
// component options: END










// endpoint options: START
The Netty4 HTTP endpoint is configured using URI syntax:

----
netty4-http:protocol:host:port/path
----

with the following path and query parameters:

==== Path Parameters (4 parameters):


[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *protocol* | *Required* The protocol to use which is either http or https |  | String
| *host* | *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* | The host port number |  | int
| *path* | Resource path |  | String
|===


==== Query Parameters (79 parameters):


[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *bridgeEndpoint* (common) | If the option is true, the producer will ignore the Exchange.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
| *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) | 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) | When netty works on nio mode, it uses default bossCount parameter from Netty, which is 1. User can use this operation to override the default bossCount from Netty | 1 | int
| *bossGroup* (consumer) | Set the BossGroup which could be used for handling the new connection of the server side across the NettyEndpoint |  | EventLoopGroup
| *chunkedMaxContentLength* (consumer) | Value in bytes the max content length per chunked frame received on the Netty HTTP server. | 1048576 | int
| *compression* (consumer) | Allow using gzip/deflate for compression on the Netty HTTP server if the client supports it from the HTTP headers. | false | boolean
| *disconnectOnNoReply* (consumer) | If sync is enabled then this option dictates NettyConsumer if it should disconnect where there is no reply to send back. | true | boolean
| *httpMethodRestrict* (consumer) | To disable HTTP methods on the Netty HTTP consumer. You can specify multiple separated by comma. |  | String
| *mapHeaders* (consumer) | 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
| *maxHeaderSize* (consumer) | 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
| *nettyServerBootstrapFactory* (consumer) | To use a custom NettyServerBootstrapFactory |  | NettyServerBootstrap Factory
| *nettySharedHttpServer* (consumer) | To use a shared Netty HTTP server. See Netty HTTP Server Example for more details. |  | NettySharedHttpServer
| *noReplyLogLevel* (consumer) | 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
| *serverClosedChannel ExceptionCaughtLogLevel* (consumer) | 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
| *serverExceptionCaughtLog Level* (consumer) | If the server (NettyConsumer) catches an exception then its logged using this logging level. | WARN | LoggingLevel
| *serverInitializerFactory* (consumer) | To use a custom ServerInitializerFactory |  | ServerInitializer Factory
| *traceEnabled* (consumer) | Specifies whether to enable HTTP TRACE for this Netty HTTP consumer. By default TRACE is turned off. | false | boolean
| *urlDecodeHeaders* (consumer) | 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.netty4.http.NettyHttpBinding then you would need to decode the headers accordingly to this option. | false | boolean
| *usingExecutorService* (consumer) | 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) | To use a custom ClientInitializerFactory |  | ClientInitializer Factory
| *lazyChannelCreation* (producer) | 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
| *okStatusCodeRange* (producer) | 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
| *producerPoolEnabled* (producer) | 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
| *producerPoolMaxActive* (producer) | 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. | -1 | int
| *producerPoolMaxIdle* (producer) | Sets the cap on the number of idle instances in the pool. | 100 | int
| *producerPoolMinEvictable Idle* (producer) | 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) | Sets the minimum number of instances allowed in the producer pool before the evictor thread (if active) spawns new objects. |  | int
| *useRelativePath* (producer) | Sets whether to use a relative path in HTTP requests. | 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
| *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.netty4.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
| *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
| *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 operation 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
| *decoder* (codec) | *Deprecated* To use a single decoder. This options is deprecated use encoders instead. |  | ChannelHandler
| *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
| *encoder* (codec) | *Deprecated* To use a single encoder. This options is deprecated use encoders instead. |  | ChannelHandler
| *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,TLSv1.1,TLSv1.2 | String
| *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.netty4.http.NettyHttpSecurityConfiguration for configuring secure web resources. |  | NettyHttpSecurity Configuration
| *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
| *bridgeErrorHandler* (consumer) | Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. 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
| *exceptionHandler* (consumer) | 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) | Sets the exchange pattern when the consumer creates an exchange. |  | ExchangePattern
| *bootstrapConfiguration* (advanced) | To use a custom configured NettyServerBootstrapConfiguration for configuring this endpoint. |  | NettyServerBootstrap Configuration
| *synchronous* (advanced) | Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported). | false | boolean
|===
// endpoint options: END
// spring-boot-auto-configure options: START
=== Spring Boot Auto-Configuration

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

[source,xml]
----
<dependency>
  <groupId>org.apache.camel</groupId>
  <artifactId>camel-netty4-http-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>
----


The component supports 32 options, which are listed below.



[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *camel.component.netty4-http.configuration.bridge-endpoint* | If the option is true, the producer will ignore the Exchange.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
| *camel.component.netty4-http.configuration.chunked-max-content-length* | Value in bytes the max content length per chunked frame received on the Netty HTTP server. | 1048576 | Integer
| *camel.component.netty4-http.configuration.compression* | Allow using gzip/deflate for compression on the Netty HTTP server if the client supports it from the HTTP headers. | false | Boolean
| *camel.component.netty4-http.configuration.disable-stream-cache* | 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 {@link org.apache.camel.Exchange} may not be able to read the Netty stream, because Netty has closed it. | false | Boolean
| *camel.component.netty4-http.configuration.host* | The local hostname such as localhost, or 0.0.0.0 when being a consumer. The remote HTTP server hostname when using producer. |  | String
| *camel.component.netty4-http.configuration.map-headers* | 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
| *camel.component.netty4-http.configuration.match-on-uri-prefix* | Whether or not Camel should try to find a target consumer by matching the URI prefix if no exact match is found. | false | Boolean
| *camel.component.netty4-http.configuration.max-header-size* | The maximum length of all headers. If the sum of the length of each header exceeds this value, a {@link io.netty.handler.codec.TooLongFrameException} will be raised. | 8192 | Integer
| *camel.component.netty4-http.configuration.ok-status-code-range* | The status codes which are considered a success response. The values are inclusive. Multiple ranges can be defined, separated by comma, e.g. <tt>200-204,209,301-304</tt>. Each range must be a single number or from-to with the dash included. <p/> The default range is <tt>200-299</tt> | 200-299 | String
| *camel.component.netty4-http.configuration.path* | Resource path |  | String
| *camel.component.netty4-http.configuration.port* | The port number. Is default 80 for http and 443 for https. |  | Integer
| *camel.component.netty4-http.configuration.protocol* | The protocol to use which is either http or https |  | String
| *camel.component.netty4-http.configuration.send503when-suspended* | 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
| *camel.component.netty4-http.configuration.throw-exception-on-failure* | 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
| *camel.component.netty4-http.configuration.transfer-exception* | 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. <p/> 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
| *camel.component.netty4-http.configuration.url-decode-headers* | 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.netty4.http.NettyHttpBinding then you would need to decode the headers accordingly to this option. | false | Boolean
| *camel.component.netty4-http.configuration.use-relative-path* | Sets whether to use a relative path in HTTP requests. | false | Boolean
| *camel.component.netty4-http.enabled* | Enable netty4-http component | true | Boolean
| *camel.component.netty4-http.executor-service* | To use the given EventExecutorGroup. The option is a io.netty.util.concurrent.EventExecutorGroup type. |  | String
| *camel.component.netty4-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. |  | String
| *camel.component.netty4-http.maximum-pool-size* | The thread pool size for the EventExecutorGroup if its in use. The default value is 16. | 16 | Integer
| *camel.component.netty4-http.netty-http-binding* | To use a custom org.apache.camel.component.netty4.http.NettyHttpBinding for binding to/from Netty and Camel Message API. The option is a org.apache.camel.component.netty4.http.NettyHttpBinding type. |  | String
| *camel.component.netty4-http.resolve-property-placeholders* | Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders. | true | Boolean
| *camel.component.netty4-http.security-configuration.authenticate* | Whether to enable authentication <p/> This is by default enabled. |  | Boolean
| *camel.component.netty4-http.security-configuration.constraint* | The supported restricted. <p/> Currently only Basic is supported. |  | String
| *camel.component.netty4-http.security-configuration.login-denied-logging-level* | Sets a logging level to use for logging denied login attempts (incl stacktraces) <p/> This level is by default DEBUG. |  | LoggingLevel
| *camel.component.netty4-http.security-configuration.realm* | Sets the name of the realm to use. |  | String
| *camel.component.netty4-http.security-configuration.role-class-name* | Sets a logging level to use for logging denied login attempts (incl stacktraces) <p/> This level is by default DEBUG. |  | String
| *camel.component.netty4-http.security-configuration.security-authenticator* | Sets the {@link SecurityAuthenticator} to use for authenticating the {@link HttpPrincipal}. |  | SecurityAuthenticator
| *camel.component.netty4-http.security-configuration.security-constraint* | Sets a {@link SecurityConstraint} to use for checking if a web resource is restricted or not <p/> By default this is <tt>null</tt>, which means all resources is restricted. |  | SecurityConstraint
| *camel.component.netty4-http.ssl-context-parameters* | To configure security using SSLContextParameters. The option is a org.apache.camel.support.jsse.SSLContextParameters type. |  | String
| *camel.component.netty4-http.use-global-ssl-context-parameters* | Enable usage of global SSL context parameters. | false | Boolean
|===
// spring-boot-auto-configure options: END







### Message Headers

The following headers can be used on the producer to control the HTTP
request.

[width="100%",cols="10%,10%,80%",options="header",]
|=======================================================================
|Name |Type |Description

|`CamelHttpMethod` |`String` |Allow to control what HTTP method to use such as GET, POST, TRACE etc.
The type can also be a `io.netty.handler.codec.http.HttpMethod`
instance.

|`CamelHttpQuery` |`String` |Allows to provide URI query parameters as a `String` value that
overrides the endpoint configuration. Separate multiple parameters using
the & sign. For example: `foo=bar&beer=yes`.

|`CamelHttpPath` |`String` |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.

|`Content-Type` |`String` |To set the content-type of the HTTP body. For example:
`text/plain; charset="UTF-8"`.

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

The following headers is provided as meta-data when a route starts from
an Netty4 HTTP endpoint:

The description in the table takes offset in a route having:
`from("netty4-http:http:0.0.0.0:8080/myapp")...`

[width="100%",cols="10%,10%,80%",options="header",]
|=======================================================================
|Name |Type |Description

|`CamelHttpMethod` |`String` |The HTTP method used, such as GET, POST, TRACE etc.

|`CamelHttpUrl` |`String` |The URL including protocol, host and port, etc: 
`http://0.0.0.0:8080/myapp`

|`CamelHttpUri` |`String` |The URI without protocol, host and port, etc:
`/myapp`

|`CamelHttpQuery` |`String` |Any query parameters, such as `foo=bar&beer=yes`

|`CamelHttpRawQuery` |`String` |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).

|`CamelHttpPath` |`String` |Additional context-path. This value is empty if the client called the
context-path `/myapp`. If the client calls `/myapp/mystuff`, then this
header value is `/mystuff`. In other words its the value after the
context-path configured on the route endpoint.

|`CamelHttpCharacterEncoding` |`String` |The charset from the content-type header.

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

|`Content-Type` |`String` |The content type if provided. For example:
`text/plain; charset="UTF-8"`.
|=======================================================================

### Access to Netty types

This component uses the
`org.apache.camel.component.netty4.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.

[source,java]
----------------------------------------------------------------------------------------------------------
io.netty.handler.codec.http.HttpRequest request = exchange.getIn(NettyHttpMessage.class).getHttpRequest();
----------------------------------------------------------------------------------------------------------

### Examples

In the route below we use Netty4 HTTP as a HTTP server, which returns
back a hardcoded "Bye World" message.

[source,java]
-----------------------------------------------
    from("netty4-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:

[source,java]
------------------------------------------------------------------------------------------------------------
    String out = template.requestBody("netty4-http:http://0.0.0.0:8080/foo", "Hello World", String.class);
    System.out.println(out);
------------------------------------------------------------------------------------------------------------

And we get back "Bye World" as the output.

### How do I let Netty match wildcards

By default Netty4 HTTP will only match on exact uri's. But you can
instruct Netty to match prefixes. For example

[source,java]
-----------------------------------------------------------
from("netty4-http:http://0.0.0.0:8123/foo").to("mock:foo");
-----------------------------------------------------------

In the route above Netty4 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:

[source,java]
---------------------------------------------------------------------------------
from("netty4-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:

[source,java]
-----------------------------------------------------------------------------
from("netty4-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 Netty4 HTTP that shares the same port (eg 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.netty4.NettyServerBootstrapConfiguration`
configuration class. If you have configured another route with different
options, Camel will throw an exception on startup, indicating the
options is not identical. To mitigate this ensure all options is
identical.

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

*Two routes sharing the same port*

[source,java]
-----------------------------------------------
from("netty4-http:http://0.0.0.0:{{port}}/foo")
  .to("mock:foo")
  .transform().constant("Bye World");

from("netty4-http:http://0.0.0.0:{{port}}/bar")
  .to("mock:bar")
  .transform().constant("Bye Camel");
-----------------------------------------------

And here is an example of a mis configured 2nd route that do not have
identical
`org.apache.camel.component.netty4.NettyServerBootstrapConfiguration`
option as the 1st route. This will cause Camel to fail on startup.

*Two routes sharing the same port, but the 2nd route is misconfigured
and will fail on starting*

[source,java]
--------------------------------------------------------------------------------------
from("netty4-http:http://0.0.0.0:{{port}}/foo")
  .to("mock:foo")
  .transform().constant("Bye World");

// we cannot have a 2nd route on same port with SSL enabled, when the 1st route is NOT
from("netty4-http:http://0.0.0.0:{{port}}/bar?ssl=true")
  .to("mock:bar")
  .transform().constant("Bye Camel");
--------------------------------------------------------------------------------------

#### Reusing same server bootstrap configuration with multiple routes

By configuring the common server bootstrap option in an single instance
of a
`org.apache.camel.component.netty4.NettyServerBootstrapConfiguration`
type, we can use the `bootstrapConfiguration` option on the Netty4 HTTP
consumers to refer and reuse the same options across all consumers.

[source,xml]
-----------------------------------------------------------------------------------------------------------------
<bean id="nettyHttpBootstrapOptions" class="org.apache.camel.component.netty4.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

[source,xml]
----------------------------------------------------------------------------------------------------------
<route>
  <from uri="netty4-http:http://0.0.0.0:{{port}}/foo?bootstrapConfiguration=#nettyHttpBootstrapOptions"/>
  ...
</route>

<route>
  <from uri="netty4-http:http://0.0.0.0:{{port}}/bar?bootstrapConfiguration=#nettyHttpBootstrapOptions"/>
  ...
</route>

<route>
  <from uri="netty4-http:http://0.0.0.0:{{port}}/beer?bootstrapConfiguration=#nettyHttpBootstrapOptions"/>
  ...
</route>
----------------------------------------------------------------------------------------------------------

#### Reusing same server bootstrap configuration with multiple routes across multiple bundles in OSGi container

See the Netty HTTP Server Example
for more details and example how to do that.

### Using HTTP Basic Authentication

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

[source,java]
------------------------------------------------------------------------------------------
<route>
   <from uri="netty4-http:http://0.0.0.0:{{port}}/foo?securityConfiguration.realm=karaf"/>
   ...
</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 (karaf in the example above) and use the JAAS realm and the
JAAS \{\{LoginModule}}s of this realm for authentication.

End user of Apache Karaf / ServiceMix has a karaf realm out of the box,
and hence why the example above would work out of the box in these
containers.

#### Specifying ACL on web resources

The `org.apache.camel.component.netty4.http.SecurityConstraint` allows
to define constrains 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:

[source,xml]
-------------------------------------------------------------------------------------------------
  <bean id="constraint" class="org.apache.camel.component.netty4.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 define so that

* access to /* is restricted and any roles is 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 which means no authentication is
needed, 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:

[source,xml]
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
<route>
   <from uri="netty4-http:http://0.0.0.0:{{port}}/foo?matchOnUriPrefix=true&amp;securityConfiguration.realm=karaf&amp;securityConfiguration.securityConstraint=#constraint"/>
   ...
</route>
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------

### See Also

* Configuring Camel
* Component
* Endpoint
* Getting Started

* <<netty-component,Netty>>
* Netty HTTP Server Example
* <<jetty-component,Jetty>>
