php - Http failure response for (unknown url): 0 Unknown Error


I'm currently developing a service-based system and having some problems with the http requests(seems to be a problem with CORS - Cross origin resource sharing).

The API where I'm sending the request is written in PHP, with the Slim framework and I'm actually enabling CROS with the following code:

$app->add(function ($req, $res, $next) {
    $response = $next($req, $res);
    return $response
            ->withHeader('Access-Control-Allow-Origin', '')
            ->withHeader('Access-Control-Allow-Headers', 'X-Requested-With, Content-Type, Accept, Origin, Authorization')
            ->withHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, PATCH, OPTIONS');

But when I send requests from the front-end(written with Angular):

this.http.get(this.base_url + "api/users/")
        (data) => {
        (error) => {

I get the following error:


message:"Http failure response for (unknown url): 0 Unknown Error"

The two projects are running in Docker, if that's adds an information.

Does anyone has any idea where the problem could be?

Thank you in advance!




it is usually 500 code internal server error for this case.

Similar causes:

1. Server (API) not running or disconnected
2. Your api code has problem
3. You specify wrong url

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