code: def initiate_upgrade_connection(self, headers, path):
          # type: (List[Tuple[bytes, bytes]], str) -> None
          
          if self.client:
              raise LocalProtocolError(
                  "Cannot initiate an upgrade connection when acting as the client"
              )
          upgrade_request = h11.Request(method=b"GET", target=path, headers=headers)
          h11_client = h11.Connection(h11.CLIENT)
          self.receive_data(h11_client.send(upgrade_request))
docs: Initiate an upgrade connection.
  
          This should be used if the request has already be received and
          parsed.