Why Am I Getting a \"Preflight Request Failing with Error: Invalid HTTP Status Code 404\" in My AngularJS Application?

Preflight Request Failing with Error: Invalid HTTP Status Code 404

In AngularJS applications, attempting to perform a POST request can sometimes result in the following error message: "Response for preflight has invalid HTTP status code 404." This error occurs due to an issue with Cross-Origin Resource Sharing (CORS) policy.

CORS policy, implemented by most modern browsers, ensures that web applications can safely make requests to other domains. Before making the actual request, the browser sends a preflight request (OPTIONS) to the server to check if the server allows the request from the originating domain.

To resolve this issue, ensure that the server responds to the preflight request with the appropriate headers. Specifically, the server should set the following headers:

• Access-Control-Allow-Headers
• Content-Type
• Access-Control-Allow-Methods
• Access-Control-Allow-Origin

For example, in SlimPHP, you can set these headers using the response().headers() method:

Additionally, you may need to disable automatic preflight handling by modifying the AngularJS configuration:

By configuring the server to handle preflight requests and disabling automatic preflight handling in AngularJS, you can successfully make POST requests from your AngularJS client to your server.

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