jQuery AJAX calls not handling CORS correctly in a microservices architecture
Quick question that's been bugging me - During development, I've been integrating various microservices for our new product feature and need to make sure that our jQuery AJAX calls handle CORS properly. When I try to fetch data from one of our APIs hosted on a different domain, I keep facing the dreaded CORS errors in the console. The API is set up to allow requests from specific origins, yet the browser still blocks the request. Here’s the AJAX call I’m using: ```javascript $.ajax({ url: 'https://api.example.com/data', type: 'GET', dataType: 'json', success: function(data) { console.log(data); }, error: function(jqXHR, textStatus, errorThrown) { console.error(textStatus, errorThrown); } }); ``` Adding headers on the server-side seems like a viable solution, yet I'm still not seeing the expected results. I've confirmed that the server includes the following headers: ``` Access-Control-Allow-Origin: https://myapp.example.com Access-Control-Allow-Methods: GET, POST, OPTIONS Access-Control-Allow-Headers: Content-Type ``` It’s puzzling because when I use Postman, the requests succeed without any issues, which points me towards a front-end misconfiguration. I've also tried enabling `withCredentials` in the AJAX call, but that doesn’t seem to help either, especially since it’s not an authenticated request. A colleague suggested reviewing the preflight response since the request type is `GET`, and the server should respond to `OPTIONS` requests correctly. Despite confirming that the server properly handles preflight checks, there’s still no breakthrough. What could I be missing? In addition, any insights into debugging CORS issues effectively would be appreciated. It feels like I’m in a loop trying to sort out these cross-origin requests. Also, checking with the network tab in Chrome reveals that the OPTIONS request returns a 200 OK but still results in a block on the actual GET request. Has anyone dealt with a similar issue in a microservices setup using jQuery? Any guidance on best practices for configuring CORS in this context would be incredibly helpful. This is part of a larger CLI tool I'm building. Thanks in advance!