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Netty HTTP Component

Available as of Camel 2.12

The netty-http component is an extension to Netty component to facilitiate HTTP transport with Netty.

This camel component supports both producer and consumer endpoints.

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.

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://localhost:8080[?options]

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

HTTP Options

A lot more options

Important: 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 is not applicable when using this Netty HTTP component, such as options related to UDP transport.

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Name

Default Value

Description

chunked

true

Allow using chunked transfer if the client supports it from the HTTP headers.

compression

false

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

headerFilterStrategy

 

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

httpMethodRestrict

 

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

mapHeaders

true

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 org.jboss.netty.handler.codec.http.HttpRequest instance.

nettyHttpBinding

 

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

throwExceptionOnFailure

true

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

traceEnabled

false

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

transferException

false

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.

urlDecodeHeaders

true

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.

Message Headers

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

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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 org.jboss.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.

Content-Type

String

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

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

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

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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

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.

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.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:

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

Examples

In the route below we use Netty HTTP as a HTTP server, which returns back 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://localhost:8080/foo", "Hello World", String.class);
    System.out.println(out);

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

See Also

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