About writing the middleware

1

Hello, I’m new in slim frame work.

I would like to know what is the different with the code below

$app->add(function ($request, $response, $next) {
    $response = $next($request, $response);
    return $response
            ->withHeader('Access-Control-Allow-Origin', 'https://mysite.com')
            ->withHeader('Access-Control-Allow-Headers', 'X-Requested-With, Content-Type, Accept, Origin, Authorization')
            ->withHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, OPTIONS');
});

and this

$app->add(function ($request, $response, $next) {
    $response = $next($request, $response);
    $response->withHeader('Access-Control-Allow-Origin', 'https://mysite.com')
            ->withHeader('Access-Control-Allow-Headers', 'X-Requested-With, Content-Type, Accept, Origin, Authorization')
            ->withHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, OPTIONS');
    return $response;
});

when I use the second statement, the header seem like won’t send out.

Can anybody give me help.

2

The middleware can have code running before or after the response is sent out.
In your case you want to change the reponse before its sent.
Try the code bellow

$app->add(function ($request, $response, $next) {
    $response = $response
        ->withHeader('Access-Control-Allow-Origin', 'https://mysite.com')
        ->withHeader('Access-Control-Allow-Headers', 'X-Requested-With, Content-Type, Accept, Origin, Authorization')
        ->withHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, OPTIONS');

  return $next($request, $response);
});
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