commit 4380217c0aa51adff8f624ba412e415e6493413a
author Rajesh Mahindra <rmahindra@uber.com> Tue Jul 24 20:00:14 2018
committer Commit Bot <commit-bot@chromium.org> Tue Jul 24 20:00:14 2018
tree 71545b7e13e42664b62fd4e8999d7e58b0bdeea6
parent c51b558293f7efc331259a69e4f69b61dda91555

Enabling quic_server to act as a HTTP proxy serving QUIC clients.

To add the functionality of a reverse proxy to the QUIC server, 2 classes
were added:
1. QuicHttpProxyBackend: Implements the interface: QuicSimpleServerBackend
to fetch the response from a backend server. Creates a proxy thread and manages an instance of
   net::URLRequestContext within that thread to make HTTP calls to a backend
   server.
2. QuicHttpProxyBackendStream: Created on a per-stream basis, manages an
   instance of the class net::URLRequest to make a single HTTP call to the
   backend server using the context created by QuicHttpProxyBackend.

Run As a Proxy
To run the quic_server as a reverse proxy, run
with --mode=proxy. The param --quic_proxy_backend_url specifies the
backend server from which the response is fetched. For instance,

./out/Default/quic_server \
  --certificate_file=net/tools/quic/certs/out/leaf_cert.pem \
  --key_file=net/tools/quic/certs/out/leaf_cert.pkcs8 \
  --mode=proxy \
  --quic_proxy_backend_url=http://localhost

R=rch@chromium.org, zhongyi@chromium.org

Change-Id: I79b7d66eb6bba9628d99181def004c0a5ea2e214
Reviewed-on: https://chromium-review.googlesource.com/1128323
Commit-Queue: Ryan Hamilton <rch@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577650}