The `source.headers.toMultimap()` call in WebViewActivity makes all the names lowercase. (cherry picked from commit 284880d096d1a4e4f746cc49de945f3186207285)
The `source.headers.toMultimap()` call in WebViewActivity makes all the names lowercase. (cherry picked from commit 284880d096d1a4e4f746cc49de945f3186207285)