Is there a way to eliminate the need for OPTIONS when making a CORS GET request with custom headers?

Currently, I am performing a CORS request using Angular resource which is resulting in a preflight OPTIONS call being executed. This seems to be happening because of a custom header that I have included.

I am wondering if there is a way to configure this setup so that the custom header (referred to as X-Auth-Token) does not trigger an OPTIONS request. Is it possible to avoid this behavior for specific custom headers?

The OPTIONS request is causing some transaction on the server that I would like to eliminate. Any suggestions on how to achieve this?

javascriptangularjshttpcors

Answer №1

When it comes to making requests with custom headers, the need for a preflight request is pretty much set in stone. However, if you're able to remove those custom headers, you can avoid the preflight altogether. One workaround could be relocating the X-Auth-Token header to a different location, like the query parameter. This post delves into strategies for minimizing preflight requests: Reducing CORS preflight requests

It's important to remember that an OPTIONS request should be idempotent. If your OPTIONS request ends up modifying server state as well, it might be worth addressing this issue and properly supporting preflight requests. With any user being able to initiate a preflight request to any server, ensuring that your server has proper security measures in place is crucial.

Answer №2

I am unable to leave a comment at this time, so I will provide my response as an answer:

It would be beneficial for you to refer to this particular question. To disable OPTIONS requests, you can utilize the whitelist functionality in the following manner: 

myApp.config(['$sceDelegateProvider', function($sceDelegateProvider) {
    $sceDelegateProvider.resourceUrlWhitelist(['self', 'http://mhnystatic.s3.amazonaws.com/**', 'http://mhnystatic2.s3.amazonaws.com/**']);
}])

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