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Chapter 18. Header
Overview
The header language provides a convenient way of accessing header values in the current message. When you supply a header name, the header language performs a case-insensitive lookup and returns the corresponding header value.
The header language is part of camel-core.
XML example
For example, to resequence incoming exchanges according to the value of a SequenceNumber header (where the sequence number must be a positive integer), you can define a route as follows:
<camelContext xmlns="http://camel.apache.org/schema/spring">
<route>
<from uri="SourceURL"/>
<resequence>
<language language="header">SequenceNumber</language>
</resequence>
<to uri="TargetURL"/>
</route>
</camelContext>Java example
The same route can be defined in Java, as follows:
from("SourceURL")
.resequence(header("SequenceNumber"))
.to("TargetURL");