Fixed Session::write_response_header_ref bypassing downstream modules
#289
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As mentioned in #206 (comment),
pingora_proxy::Session::write_response_header_refwill currently call directly into the downstream session and bypass downstream modules. This might mess up compression for example.Instead of duplicating the code triggering modules I decided to make this call
Session::write_response_headerwith a clonedresp– this is how this works anyway, merely a few levels further down.