Cross-origin resource sharing library and stack middleware

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v2.0.2 2020-10-29 16:03 UTC


Library and middleware enabling cross-origin resource sharing for your http-{foundation,kernel} using application. It attempts to implement the W3C Recommendation for cross-origin resource sharing.

Build status: .github/workflows/run-tests.yml


Require asm89/stack-cors using composer.


This package can be used as a library or as stack middleware.


Option Description Default value
allowedMethods Matches the request method. array()
allowedOrigins Matches the request origin. array()
allowedOriginsPatterns Matches the request origin with preg_match. array()
allowedHeaders Sets the Access-Control-Allow-Headers response header. array()
exposedHeaders Sets the Access-Control-Expose-Headers response header. false
maxAge Sets the Access-Control-Max-Age response header. false
supportsCredentials Sets the Access-Control-Allow-Credentials header. false

The allowedMethods and allowedHeaders options are case-insensitive.

You don't need to provide both allowedOrigins and allowedOriginsPatterns. If one of the strings passed matches, it is considered a valid origin.

If array('*') is provided to allowedMethods, allowedOrigins or allowedHeaders all methods / origins / headers are allowed.

Example: using the library


use Asm89\Stack\CorsService;

$cors = new CorsService(array(
    'allowedHeaders'         => array('x-allowed-header', 'x-other-allowed-header'),
    'allowedMethods'         => array('DELETE', 'GET', 'POST', 'PUT'),
    'allowedOrigins'         => array('http://localhost'),
    'allowedOriginsPatterns' => array('/localhost:\d/'),
    'exposedHeaders'         => false,
    'maxAge'                 => false,
    'supportsCredentials'    => false,

$cors->addActualRequestHeaders(Response $response, $origin);
$cors->handlePreflightRequest(Request $request);
$cors->isActualRequestAllowed(Request $request);
$cors->isCorsRequest(Request $request);
$cors->isPreflightRequest(Request $request);

Example: using the stack middleware


use Asm89\Stack\Cors;

$app = new Cors($app, array(
    // you can use array('*') to allow any headers
    'allowedHeaders'      => array('x-allowed-header', 'x-other-allowed-header'),
    // you can use array('*') to allow any methods
    'allowedMethods'      => array('DELETE', 'GET', 'POST', 'PUT'),
    // you can use array('*') to allow requests from any origin
    'allowedOrigins'      => array('localhost'),
    // you can enter regexes that are matched to the origin request header
    'allowedOriginsPatterns' => array('/localhost:\d/'),
    'exposedHeaders'      => false,
    'maxAge'              => false,
    'supportsCredentials' => false,