Proxy-Authorization not returned

[aliowka]

Looks like #251 is still there.

[javabrett]

Does not reproduce on a current master branch local Docker container, but does on http://httpbin.org . My guess is that this is a hosting-feature from Vegur:

< HTTP/1.1 200 OK
< Connection: keep-alive
< Server: gunicorn/19.9.0
< Date: Thu, 26 Jul 2018 21:52:13 GMT
< Content-Type: application/json
< Content-Length: 537
< Access-Control-Allow-Origin: *
< Access-Control-Allow-Credentials: true
< Via: 1.1 vegur

https://github.com/heroku/vegur/blob/a2799234e1ae08beba22234ef0d106c94ddcdfa3/src/vegur_headers.erl#L110

delete_hop_by_hop([{<<"proxy-authorization">>, _} | Hdrs]) -> delete_hop_by_hop(Hdrs);

By the RFC I would expect this header to be consumed/dropped by an inbound proxy-chain.

Do you have a firm requirement for it? Maybe run a local instance?