def _selectParseHeader(self, header):
        elements = header.split(b' ')
        scheme = elements[0].lower()
        for fact in self._credentialFactories:
            if fact.scheme == scheme:
                return (fact, b' '.join(elements[1:]))
        return (None, None)
Choose an C{ICredentialFactory} from C{_credentialFactories}
dataset/ETHPy150Open twisted/twisted/twisted/web/_auth/wrapper.py/HTTPAuthSessionWrapper._selectParseHeader