Comment 6 for bug 1397318

I get 204 on my system:

$ curl -i -H "X-Auth-Token: $TOKEN" http://localhost:5000/v3/OS-INHERIT/domains/default/users/$USER_ID/roles/$ROLE_ID/inherited_to_projects
HTTP/1.1 204 No Content
Vary: X-Auth-Token
Content-Length: 0
Date: Thu, 15 Jan 2015 00:04:03 GMT

$ curl -i -I -H "X-Auth-Token: $TOKEN" http://localhost:5000/v3/OS-INHERIT/domains/default/users/$USER_ID/roles/$ROLE_ID/inherited_to_projects
HTTP/1.1 204 No Content
Vary: X-Auth-Token
Content-Length: 0
Date: Thu, 15 Jan 2015 00:04:20 GMT

$ curl -i -X HEAD -H "X-Auth-Token: $TOKEN" http://localhost:5000/v3/OS-INHERIT/domains/default/users/$USER_ID/roles/$ROLE_ID/inherited_to_projects
HTTP/1.1 204 No Content
Vary: X-Auth-Token
Content-Length: 0
Date: Thu, 15 Jan 2015 00:05:04 GMT

Why are you getting Content-Length: 334 ? I don't think there can be any content.