Method set_tunnel

src/urllib3/connection.py:227–239

(
        self,
        host: str,
        port: int | None = None,
        headers: typing.Mapping[str, str] | None = None,
        scheme: str = "http",
    )

        return sock

    def set_tunnel(
        self,
        host: str,
        port: int | None = None,
        headers: typing.Mapping[str, str] | None = None,
        scheme: str = "http",
    ) -> None:
        if scheme not in ("http", "https"):
            raise ValueError(
                f"Invalid proxy scheme for tunneling: {scheme!r}, must be either 'http' or 'https'"
            )
        super().set_tunnel(host, port=port, headers=headers)
        self._tunnel_scheme = scheme

    if sys.version_info < (3, 11, 9) or ((3, 12) <= sys.version_info < (3, 12, 3)):
        # Taken from python/cpython#100986 which was backported in 3.11.9 and 3.12.3.