Proxy.py broken for Android Emulators

[abhinavsingh]

Seen following logs when running Android emulator via proxy.py

2019-09-02 21:11:15,572 - INFO - pid:6909 - set_host_port:409 - b'[2607:f8b0:4005:802::2003]:443'
2019-09-02 21:11:15,572 - ERROR - pid:6909 - run:1083 - Exception while handling connection <socket.socket fd=44, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('10.0.0.236', 8899), raddr=('10.0.0.236', 59065)> with reason ValueError('too many values to unpack (expected 2)')
Traceback (most recent call last):
  File "./proxy.py", line 1077, in run
    teardown = self.run_once()
  File "./proxy.py", line 1042, in run_once
    self.request.parse(client_data)
  File "./proxy.py", line 429, in parse
    more, raw = self.process(raw)
  File "./proxy.py", line 460, in process
    self.process_line(line)
  File "./proxy.py", line 501, in process_line
    self.set_host_port()
  File "./proxy.py", line 410, in set_host_port
    self.host, self.port = self.url.path.split(COLON)
ValueError: too many values to unpack (expected 2)

[abhinavsingh]

Android emulator seems to be expecting pretty hardcoded responses from proxy. Specifically, it only expects a 200 OK header in response to CONNECT request. Code logic can be found here https://github.com/aosp-mirror/platform_external_qemu/blob/a7c579bdcbe2543472535718d3b637cb864f6f36/proxy/proxy_common.c and https://android.googlesource.com/platform/external/qemu/+/master/proxy/proxy_http_connector.c