config.gceMetadata calls ctxhttp.Do, which calls http.Client.Do

frontend.Client.fetchJSONPage calls http.Client.Get

auth.Header calls oauth2.reuseTokenSource.Token, which eventually calls http.Client.PostForm

css.main calls http.Get

queue.New calls apiv2.NewClient, which eventually calls http.Request.Write

auth.HeadersTransport.RoundTrip calls http.Transport.RoundTrip