Repairing proxy

* Copy headers
* Copy status
* Copy content as bytestream

To manage request download url #82038.
Proxy all urls by default

Skip ringojs proxy by default. Fixes #75729
ProxyUtils changes.

Remove unused code. #75729
Merge JsgiServlet with upstream
Merge pull request #2 from alediator/79492_JsgiProxyServlet_fix

79492 jsgi proxy servlet fix