Fix nginx_jwt_resp HTTP responses

webapp/views.py

@@ -339,13 +339,13 @@ class SignupViewSet(ModelViewSet):
 def nginx_jwt_resp(request, *args, **kwargs):
     accessKey = request.COOKIES.get("jwt_access", None)
     if not accessKey:
-        return HttpResponse("", status=401)
+        return HttpResponse("No valid access token", status=401)
     try:
         # This also verifies the signature.
         # See https://pyjwt.readthedocs.io/en/latest/usage.html#reading-the-claimset-without-validation
         token = decode(accessKey, settings.SECRET_KEY, algorithms=["HS256"])
     except InvalidTokenError:
-        return HttpResponse("", status=403)
+        return HttpResponse("Invalid access token", status=401)
     user = "admin" if token.get("username", "") == "admin" else "moderator"
     resp = HttpResponse("", status=200)
     resp["X-FBrowser-User"] = user