Django接收自定义http header过程详解

class WSGIRequestHandler(BaseHTTPRequestHandler):

  server_version = "WSGIServer/" + __version__

  def get_environ(self):
    env = self.server.base_environ.copy()
    env['SERVER_PROTOCOL'] = self.request_version
    env['REQUEST_METHOD'] = self.command
    if '?' in self.path:
      path,query = self.path.split('?',1)
    else:
      path,query = self.path,''

    env['PATH_INFO'] = urllib.unquote(path)
    env['QUERY_STRING'] = query

    host = self.address_string()
    if host != self.client_address[0]:
      env['REMOTE_HOST'] = host
    env['REMOTE_ADDR'] = self.client_address[0]

    if self.headers.typeheader is None:
      env['CONTENT_TYPE'] = self.headers.type
    else:
      env['CONTENT_TYPE'] = self.headers.typeheader

    length = self.headers.getheader('content-length')
    if length:
      env['CONTENT_LENGTH'] = length

    for h in self.headers.headers:
      k,v = h.split(':',1)
      k=k.replace('-','_').upper(); v=v.strip()
      if k in env:
        continue          # skip content length, type,etc.
      if 'HTTP_'+k in env:
        env['HTTP_'+k] += ','+v   # comma-separate multiple headers
      else:
        env['HTTP_'+k] = v
    return env

  def get_stderr(self):
    return sys.stderr

  def handle(self):
    """Handle a single HTTP request"""

    self.raw_requestline = self.rfile.readline()
    if not self.parse_request(): # An error code has been sent, just exit
      return

    handler = ServerHandler(
      self.rfile, self.wfile, self.get_stderr(), self.get_environ()
    )
    handler.request_handler = self   # backpointer for logging
    handler.run(self.server.get_app())

class WSGIRequest(http.HttpRequest):
  def __init__(self, environ):
    script_name = base.get_script_name(environ)
    path_info = base.get_path_info(environ)
    if not path_info:
      # Sometimes PATH_INFO exists, but is empty (e.g. accessing
      # the SCRIPT_NAME URL without a trailing slash). We really need to
      # operate as if they'd requested '/'. Not amazingly nice to force
      # the path like this, but should be harmless.
      path_info = '/'
    self.environ = environ
    self.path_info = path_info
    self.path = '%s/%s' % (script_name.rstrip('/'), path_info.lstrip('/'))
    self.META = environ
    self.META['PATH_INFO'] = path_info
    self.META['SCRIPT_NAME'] = script_name
    self.method = environ['REQUEST_METHOD'].upper()
    _, content_params = self._parse_content_type(self.META.get('CONTENT_TYPE', ''))
    if 'charset' in content_params:
      try:
        codecs.lookup(content_params['charset'])
      except LookupError:
        pass
      else:
        self.encoding = content_params['charset']
    self._post_parse_error = False
    try:
      content_length = int(self.environ.get('CONTENT_LENGTH'))
    except (ValueError, TypeError):
      content_length = 0
    self._stream = LimitedStream(self.environ['wsgi.input'], content_length)
    self._read_started = False
    self.resolver_match = None