def tls_auth_handler(
        url: str,
        method: str,
        timeout: Optional[float],
        headers: List[Tuple[str, str]],
        data: bytes,
        certfile: str,
        keyfile: str,
        cafile: Optional[str] = None,
        protocol: int = ssl.PROTOCOL_TLS_CLIENT,
        insecure_skip_verify: bool = False,
) -> Callable[[], None]:
    """Handler that implements an HTTPS connection with TLS Auth.

    The default protocol (ssl.PROTOCOL_TLS_CLIENT) will also enable
    ssl.CERT_REQUIRED and SSLContext.check_hostname by default. This can be
    disabled by setting insecure_skip_verify to True.

    Both this handler and the TLS feature on pushgateay are experimental."""
    context = ssl.SSLContext(protocol=protocol)
    if cafile is not None:
        context.load_verify_locations(cafile)
    else:
        context.load_default_certs()

    if insecure_skip_verify:
        context.check_hostname = False
        context.verify_mode = ssl.CERT_NONE

    context.load_cert_chain(certfile=certfile, keyfile=keyfile)
    handler = HTTPSHandler(context=context)
    return _make_handler(url, method, timeout, headers, data, handler)
Handler that implements an HTTPS connection with TLS Auth.

The default protocol (ssl.PROTOCOL_TLS_CLIENT) will also enable
ssl.CERT_REQUIRED and SSLContext.check_hostname by default. This can be
disabled by setting insecure_skip_verify to True.

Both this handler and the TLS feature on pushgateay are experimental.
prometheus_client/exposition.py