Response to REST client from Camel CXFRS route? - apache-camel

Question

I'm trying to create a response to a REST web service call in a CXFRS Camel route, but no matter what I do the response to the client is always the same 200, not 201. Here's my route:
<route id="front-end">
<from uri="cxfrs:bean:myService" />
<setBody>
<constant>Will do...</constant>
</setBody>
<setHeader headerName="CamelHttpResponseCode">
<constant>201</constant>
</setHeader>
<setHeader headerName="Content-Type">
<constant>more/blah</constant>
</setHeader>
</route>
The body is returned but the response code and content type are ignored. What am I doing wrong?
Thanks,
Matt

Answer 1

Basically camel-cxfrs overwrites any headers set in exchange when it converts the exchange to actual HTTP response
See here:
exchange.getOut().setHeaders(binding.bindResponseHeadersToCamelHeaders(response, exchange));
And this happens because DefaultCxfRsBinding expects a jaxrs Response as a parameter.
So to fix the issue you either override DefaultCxfRsBinding with custom one in order to copy headers from exchange.getIn().
<cxf:rsServer id="MyService" address="/myAddress">
<cxf:binding><bean class="MyCustomCxfRsBinding" /></cxf:binding>
<cxf:serviceBeans>
<ref bean="myResourceWithJSR311Annotations" />
</cxf:serviceBeans>
</cxf:rsServer>
Or make your camel route to return a jaxrs Response with headers instead of setting headers in the rout or in camel processors. Something
class HttpHeaderProcessor implements Processor
{
#Override
public void process(Exchange exchange) throws Exception
{
Message message = exchange.getIn();
Response response = convertToJaxRs(message);
exchange.getIn().setBody(response);
exchange.getIn().setHeader("Test", "Won't work unless DefaultCxfRsBinding is not replaced with a custom one");
}
private Response convertToJaxRs(Message message)
{
ResponseBuilder jaxrsResponseBuilder = Response.ok(message.getBody(), MediaType.APPLICATION_XML);
jaxrsResponseBuilder.header("header1", "you'll see this");
Response response = jaxrsResponseBuilder.build();
return response;
}
}
For your sample:
<route id="front-end">
<from uri="cxfrs:bean:myService" />
<setBody>
set it to Response.ok(your message).header(x, y).build()
</setBody>
You can also use a Service bean returning a jaxrs.Response with headders
<route id="front-end">
<from uri="cxfrs:bean:myService" />
<bean ref="myServiceImpl">