* Returns a Request object

* Downloads CEF binary package according to * developer's platform and extracts it to * deps/cef

* Starts installing CEF libraries

* Extract the mime type from the given request's * _Content-Type_ header. * * @param {IncomingMessage} req * @return {String} * @api private

Implementation of the factory for for creating schema handlers. Return a new scheme handler instance to handle the request.

Implementation of the schema handler for appjs:// requests.