code: def parse_request(self):
          
          self.rfile = SizeCheckWrapper(self.conn.rfile,
                                        self.server.max_request_header_size)
          try:
              self.read_request_line()
          except MaxSizeExceeded:
              self.simple_response("414 Request-URI Too Long",
                  "The Request-URI sent with the request exceeds the maximum "
                  "allowed bytes.")
              return
          
          try:
              success = self.read_request_headers()
          except MaxSizeExceeded:
              self.simple_response("413 Request Entity Too Large",
                  "The headers sent with the request exceed the maximum "
                  "allowed bytes.")
              return
          else:
              if not success:
                  return
          
          self.ready = True
docs: Parse the next HTTP request start-line and message-headers.