def _authorizedBasicLogin(self, request):
        """
        Add an I{basic authorization} header to the given request and then
        dispatch it, starting from C{self.wrapper} and returning the resulting
        L{IResource}.
        """
        authorization = b64encode(self.username + b':' + self.password)
        request.requestHeaders.addRawHeader(b'authorization',
                                            b'Basic ' + authorization)
        return getChildForRequest(self.wrapper, request)

        Add an I{basic authorization} header to the given request and then
        dispatch it, starting from C{self.wrapper} and returning the resulting
        L{IResource}.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/test/test_httpauth.py