proxy_set_header at http level

[杨镭]

Hi all,

  Although the documentation (
http://wiki.nginx.org/HttpProxyModule#proxy_set_header) says the context of
proxy_set_header  can be http, server, location，we found that
proxy_set_header directive at http level does not work. When moved to server
level, everything works fine.

  Setting proxy_set_header at http level allows us to centralize some common
settings thus avoid manually copy those directives to each virtual host when
it was created. e.g., we use X-Http-Scheme header to let backend server know
if it's a https request, otherwise they can't know.
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