def getClientIP(self):
        return self.requestHeaders.getRawHeaders(
            b"x-forwarded-for", [b"-"])[0].split(b",")[0].strip()
@return: The client address (the first address) in the value of the
dataset/ETHPy150Open matrix-org/synapse/synapse/app/homeserver.py/XForwardedForRequest.getClientIP