X-Git-Url: https://projects.mako.cc/source/twitter-api-cdsw/blobdiff_plain/b5d973d7a0a14eca21b2981ffacf4fb9ea77ba41..29c8e0142111e03237eb8f92a9470ba90d295e10:/oauthlib/oauth2/rfc6749/endpoints/revocation.py

diff --git a/oauthlib/oauth2/rfc6749/endpoints/revocation.py b/oauthlib/oauth2/rfc6749/endpoints/revocation.py
index b73131c..662c793 100644
--- a/oauthlib/oauth2/rfc6749/endpoints/revocation.py
+++ b/oauthlib/oauth2/rfc6749/endpoints/revocation.py
@@ -74,7 +74,7 @@ class RevocationEndpoint(BaseEndpoint):
         self.request_validator.revoke_token(request.token,
                                             request.token_type_hint, request)
 
-        response_body = None
+        response_body = ''
         if self.enable_jsonp and request.callback:
             response_body = request.callback + '();'
         return {}, response_body, 200
@@ -120,8 +120,9 @@ class RevocationEndpoint(BaseEndpoint):
             raise InvalidRequestError(request=request,
                                       description='Missing token parameter.')
 
-        if not self.request_validator.authenticate_client(request):
-            raise InvalidClientError(request=request)
+        if self.request_validator.client_authentication_required(request):
+            if not self.request_validator.authenticate_client(request):
+                raise InvalidClientError(request=request)
 
         if (request.token_type_hint and
                 request.token_type_hint in self.valid_token_types and