Fixed redirect_url setting for Oauth1. (#94)

rest_social_auth/views.py

@@ -119,6 +119,10 @@ def post(self, request, *args, **kwargs):
         serializer_in = self.get_serializer_in(data=input_data)
         if self.oauth_v1() and request.backend.OAUTH_TOKEN_PARAMETER_NAME not in input_data:
             # oauth1 first stage (1st is get request_token, 2nd is get access_token)
+            manual_redirect_uri = self.request.auth_data.pop('redirect_uri', None)
+            manual_redirect_uri = self.get_redirect_uri(manual_redirect_uri)
+            if manual_redirect_uri:
+                self.request.backend.redirect_uri = manual_redirect_uri
             request_token = parse_qs(request.backend.set_unauthorized_token())
             return Response(request_token)
         serializer_in.is_valid(raise_exception=True)