[PATCH 0/7] proxy_pass cleanups

[Eric Wong <e@80x24.org>]

A bunch of cleanups to hopefully make the proxy_pass-related
code a little saner and easier-to-follow.

I introduced at least one bug during this series which got fixed
in 7/7.

Extra sets of eyes to review would be greatly appreciated, thanks!

And this is running live and serving critical information to
readers of https://yhbt.net/ in all its glory!

Once I'm reasonably satisfied with this; I'll continue work
on making "proxy_buffering: false" work, so slow-client-capable
upstreams can generate gigantic (hundreds of megabytes!)
responses without filesystem overhead.

But first, I think I should work on making those gigantic
responses cheaper in terms of memory/CPU usage outside of
yahns.  This is git-http-backend for serving mega repos
over smart HTTP, yahns is already great for dumb HTTP
git clones.

 lib/yahns/proxy_http_response.rb | 236 +++++++++++++++------------------------
 lib/yahns/proxy_pass.rb          | 171 +---------------------------
 lib/yahns/req_res.rb             | 159 ++++++++++++++++++++++++++
 3 files changed, 252 insertions(+), 314 deletions(-)

Eric Wong (7):
      proxy_pass: simplify writing request bodies upstream
      proxy_pass: hoist out proxy_res_headers method
      proxy_pass: simplify proxy_http_response
      proxy_pass: split out body and trailer reading in response
      proxy_pass: trim down proxy_response_finish, too
      proxy_pass: split out req_res into a separate file
      proxy_pass: fix resumes after complete buffering is unblocked