Why Does My AngularJS POST Request Fail with \"Invalid HTTP Status Code 404\"?

AngularJS POST Fails: Solving the Invalid HTTP Status Code

In this article, we address the issue of "Response for preflight has invalid HTTP status code 404" which arises when making POST requests from AngularJS to a server.

The provided AngularJS code sets up a GET request that successfully retrieves data from the server. However, the POST request encounters the aforementioned error due to the preflight OPTIONS request sent by the browser. CORS (Cross-Origin Resource Sharing) policy mandates that browsers send a preflight OPTIONS request before making actual requests.

In SlimPHP, the server handles CORS by setting the necessary headers. However, inspecting the request/response headers reveals that the server returns a 404 status code for the preflight OPTIONS request, which is incorrect.

To resolve this issue, the client-side AngularJS code needs to be modified to prevent the preflight OPTIONS request. This can be achieved by resetting the default headers using:

<code class="javascript">app.config(function ($httpProvider) {
  $httpProvider.defaults.headers.common = {};
  $httpProvider.defaults.headers.post = {};
  $httpProvider.defaults.headers.put = {};
  $httpProvider.defaults.headers.patch = {};
});</code>

By resetting these headers, the browser will no longer send the preflight OPTIONS request. Instead, it will send the actual POST request directly, bypassing the problematic 404 status code for the preflight request.

This solution highlights the importance of understanding CORS policy and handling preflight requests correctly. By addressing both the client-side and server-side aspects of CORS, developers can ensure successful cross-origin requests and eliminate the "invalid HTTP status code 404" error.

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