Right now the combination of X-Sendfile does not work with stream wrappers when using the BinaryFileResponse.

Setup: Nginx proxies X-Accel-Redirect files to an object store and the Symfony app accesses the object store using for instance Gaufrette.

Issue: BinaryFileResponse uses getRealPath to create the default path to the file. Stream wrapped files return an empty string here.

Solution: When $this->file->getRealPath(); is empty, let $path fall back to $this->file->getPathname();. This way users can map stream wrappers to a Nginx location using the X-Accel-Mapping header.