As I noted in an earlier post, Solar how has classes to represent simple HTTP requests and responses.

The Solar_Http_Request functionality is only for making requests, but uses adapters to make it easier to swap out the connection method later on - plus it's fluent. He includes an example of it in action, calling a remote page with a GET, POST and a customized request (including special headers)

The other side of the equation, Solar_Http_Response allows you to set all of the response information manually (again, fluently) to make custom responses simple.