Set Header

The SetHeader EIP is used for setting a message header.

Options

The Set Header eip supports 2 options, which are listed below.

Name Description Default Type

description

Sets the description of this node.

String

disabled

Whether to disable this EIP from the route during build time. Once an EIP has been disabled then it cannot be enabled later at runtime.

false

Boolean

name

Required Name of message header to set a new value The simple language can be used to define a dynamic evaluated header name to be used. Otherwise a constant name will be used.

String

expression

Required Expression to return the value of the header.

ExpressionDefinition

Using Set Header

The following example shows how to set a header in a Camel route:

  • Java

  • XML

from("direct:a")
    .setHeader("myHeader", constant("test"))
    .to("direct:b");
<route>
    <from uri="direct:a"/>
    <setHeader name="myHeader">
        <constant>test</constant>
    </setHeader>
    <to uri="direct:b"/>
</route>

In the example, the header value is a constant.

Any of the Camel languages can be used, such as Simple.

  • Java

  • XML

from("direct:a")
    .setHeader("randomNumber", simple("${random(1,100)}"))
    .to("direct:b");

Header can be set using fluent syntax.

from("direct:a")
    .setHeader("randomNumber").simple("${random(1,100)}")
    .to("direct:b");
<route>
    <from uri="direct:a"/>
    <setHeader name="randomNumber">
        <simple>${random(1,100)}</simple>
    </setHeader>
    <to uri="direct:b"/>
</route>

See JSONPath for another example.

Setting a header from another header

You can also set a header with the value from another header.

In the example, we set the header foo with the value from an existing header named bar.

  • Java

  • XML

from("direct:a")
    .setHeader("foo", header("bar"))
    .to("direct:b");
<route>
    <from uri="direct:a"/>
    <setHeader name="foo">
        <header>bar</header>
    </setHeader>
    <to uri="direct:b"/>
</route>

If you need to set several headers on the message, see Set Headers.

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