gistfile1

#!/usr/bin/env python
import collections
import gevent.monkey
import gevent.wsgi
import httplib

class ConnectionCache(collections.defaultdict):
    def __missing__(self, key):
        return httplib.HTTPConnection(key)

def convert_header(env):
    hdr = filter(lambda x: x[0].startswith('HTTP_'), env.items())
    return dict(map(lambda x: (x[0][5:].replace('_', '-').title(), x[1]), hdr))

def application(env, start_response):
    hdr = convert_header(env)
    conn = cache[env['HTTP_HOST']]

    body = env.get('wsgi.input').read()

    path = env['PATH_INFO']
    if 'QUERY_STRING' in env:
        path += '?' + env['QUERY_STRING']
    conn.request(env['REQUEST_METHOD'], path, body, hdr)

    resp = conn.getresponse()
    hdr = dict(resp.getheaders())
    if 'transfer-encoding' in hdr:
        del hdr['transfer-encoding']
    start_response('%s %s' % (resp.status, resp.reason), hdr.items())
    return resp.read()

cache = ConnectionCache()
gevent.monkey.patch_all()
gevent.wsgi.WSGIServer(('localhost', 8080), application).serve_forever()