Camel: Access incoming headers

Posted by on May 25, 2023

In HTTP requests (and other requests or messages) you usually get a payload and a bunch of headers. In Camel you can find the payload in the “body” variable like this:

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1public class MyRoute extends RouteBuilder {
2 
3    @Override
4    public void configure() throws Exception {
5           from("timer:mytimer?repeatCount=1")
6                  .to("https://www.google.com")
7                  .log("${body}");
8    }
9}

So, how do you access the headers? There is another variable for this called “in” and it can be used like this:

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01public class MyRoute extends RouteBuilder {
02 
03    @Override
04    public void configure() throws Exception {
05           from("timer:mytimer?repeatCount=1")
06                  .to("https://www.google.com")
07                  .log("${in.headers}") // Log all incoming  headers
08                  .log("${in.headers.Content-Type}"); // Log a specific header
09    }
10}

Tested on Ubuntu 20.04.4 LTS, Apache Camel 3.20, Minikube v1.29.0 (Camel-K) and Java 1.8.0_352

Java,

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