Converts the BrowserKit request to a HttpKernel request.
DomRequest $request A Request instance:
protected function filterRequest(DomRequest $request) {
$httpRequest = Request::create($request
->getUri(), $request
->getMethod(), $request
->getParameters(), $request
->getCookies(), $request
->getFiles(), $request
->getServer(), $request
->getContent());
$httpRequest->files
->replace($this
->filterFiles($httpRequest->files
->all()));
return $httpRequest;
}