Getting Player Picture with bad request in unity 5

I am using something like “v2.2/me/picture?g&width=35&height=35&redirect=false” in v2.2, to get player image in with facebook unity sdk 7.2.1, it always return me 400 bad request.
I try paste the api in “Graph API” in facebook, it can return the correct url.
Is there anything I am missing. I just upgrade my project from unity 4.6 to 5, and update facebook SDK from 6.2.1 to 7.2.1

FB.API now explicitly adds the Graph API version to each graph query. So that query will work fine if you drop the v2.2 on the front.