Set Headers
The SetHeaders EIP is used for setting multiple message headers at the same time.
Options
The Set Headers eip supports 1 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 |
Using Set Headers
The following example shows how to set multiple headers in a Camel route using Java, XML or YAML. Note that the syntax is slightly different in each case.
-
Java
-
XML
-
YAML
from("direct:a")
.setHeaders("myHeader", constant("test"), "otherHeader", constant("other"))
.to("direct:b");
<route>
<from uri="direct:a"/>
<setHeaders>
<setHeader name="myHeader">
<constant>test</constant>
</setHeader>
<setHeader name="otherHeader">
<constant>other</constant>
</setHeader>
</setHeaders>
<to uri="direct:b"/>
</route>
- from:
uri: direct:a
steps:
- setHeaders:
headers:
- name: myHeader
constant: test
- name: otherHeader
constant: other
- to:
uri:direct:b
For example, the header values are constants.
Any of the Camel languages can be used, such as Simple.
-
Java
-
XML
-
YAML
from("direct:a")
.setHeaders("randomNumber", simple("${random(1,100)}"), "body", simple("${body}"))
.to("direct:b");
<route>
<from uri="direct:a"/>
<setHeaders>
<setHeader name="randomNumber">
<simple>${random(1,100)}</simple>
</setHeader>
<setHeader name="body">
<simple>${body}</simple>
</setHeader>
</setHeaders>
<to uri="direct:b"/>
</route>
- from:
uri: direct:a
steps:
- setHeaders:
headers:
- name: randomNumber
simple: "${random(1,100)}"
- name: body
simple: "${body}"
- to:
uri:direct:b
Setting a header from another header
You can also set several headers where later ones depend on earlier ones.
In the example, we first set the header foo to the body and then set bar based on comparing foo with a value.
-
Java
-
XML
-
YAML
from("direct:a")
.setHeaders("foo", simple("${body}"), "bar", simple("${header.foo} > 10", Boolean.class))
.to("direct:b");
<route>
<from uri="direct:a"/>
<setHeaders>
<setHeader name="foo">
<simple>${body}</simple>
</setHeader>
<setHeader name="bar">
<simple resultType="java.lang.Boolean">${header.foo} > 10</simple>
</setHeader>
</setHeaders>
<to uri="direct:b"/>
</route>
- from:
uri: direct:a
steps:
- setHeaders:
headers:
- name: foo
simple: "${body}"
- name: bar
simple:
expression: "${header.foo} > 10"
resultType: "boolean"
- to:
uri:direct:b
Using a Map with Java DSL
It’s also possible to build a Map and pass it as the single argument to setHeaders().
If the order in which the headers should be set is important, use a LinkedHashMap
.
- Java
-
private Map<String, Expression> headerMap = new java.util.LinkedHashMap<>(); headerMap.put("foo", ConstantLanguage.constant("ABC")); headerMap.put("bar", ConstantLanguage.constant("XYZ")); from("direct:startMap") .setHeaders(headerMap) .to("direct:b");
If the ordering is not critical, then Map.of(name1, expr1, name2, expr2…)
can be used.
- Java
-
from("direct:startMap") .setHeaders(Map.of("foo", "ABC", "bar", "XYZ")) .to("direct:b");