Relay request to another server

A request hits my server. I want to modify the request header and send the same request to another application outside my container. How do I do that?

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You cannot send the same request instance to another server. You'll need to generate a new request. The classes in java.net can help, or you can use tools such as HttpClient.

I cannot create a new request as per the specifications given to me. I saw on some forums that this can be done at the container level (Tomcat) using Perl. Could you suggest how and could you also suggest any mechanisms by which this can be achieved?

A specification that asks for the impossible cannot be met. There may be some way to relay a request at lower levels in the IP stack, but at the servlet level, it cannot be done.

I'll move this post along to the Protocols forum.