Symfony Responses break this Middleware

[goodevilgenius]

Occasionally, some controllers or middlewares will return a Symfony Response, rather than an Illuminate Response. When this happens, this Middleware fails due to calls to $rsp->header($headerName, $headerValue). This can be easily fixed by replacing these with $rsp->headers->set($headerName, $headerValue).

Additionally, for full coverage, you could also replace calls to $req->header($headerName) with $reg->headers->get($headerName) to cover the rare occasion when a Symfony Request is used as well (I haven't actually run into that issue, personally).