Use the Slim application’s options() method to map a callback function to a resource URI that is requested with the HTTP OPTIONS method.

$app = new \Slim\Slim();
$app->options('/books/:id', function ($id) {
    //Return response headers

In this example, an HTTP OPTIONS request for “/books/1” will invoke the associated callback function, passing “1” as the callback function’s argument.

The first argument of the Slim application’s options() method is the resource URI. The last argument is anything that returns true for is_callable(). Typically, the last argument will be an anonymous function.

Method Override

Unfortunately, modern browsers do not provide native support for HTTP OPTIONS requests. To work around this limitation, ensure your HTML form’s method attribute is “post”, then add a method override parameter to your HTML form like this:

<form action="/books/1" method="post">
    ... other form fields here...
    <input type="hidden" name="_METHOD" value="OPTIONS"/>
    <input type="submit" value="Fetch Options For Book"/>

If you are using Backbone.js or a command-line HTTP client, you may also override the HTTP method by using the X-HTTP-Method-Override header.