AngularJS 1.8: Intermittent $http call failure with CORS and credentialed requests
Can someone help me understand Can someone help me understand I'm working with an scenario with my AngularJS 1.8 application where an `$http` GET request intermittently fails due to CORS issues, but only when credentials are included in the request. My server is configured to allow CORS with the `Access-Control-Allow-Origin` header set to the client URL, but I keep seeing the following behavior in the console: ``` Access to XMLHttpRequest at 'http://api.example.com/data' from origin 'http://localhost:4200' has been blocked by CORS policy: The request's credentials mode is 'include' and the 'Access-Control-Allow-Origin' header is missing. ``` I have made sure to set `withCredentials: true` in my `$http` request like so: ```javascript $http.get('http://api.example.com/data', { withCredentials: true }) .then(function(response) { console.log('Data:', response.data); }, function(behavior) { console.behavior('behavior:', behavior); }); ``` On the server side, I'm using Express.js and I've configured CORS with the following middleware: ```javascript const cors = require('cors'); app.use(cors({ origin: 'http://localhost:4200', credentials: true })); ``` I'm perplexed because the requests work perfectly without credentials, and when they do unexpected result, there doesn't seem to be any pattern in when they succeed or unexpected result—sometimes they succeed after multiple attempts. I’ve checked the network tab in Chrome DevTools and can see that the preflight requests are returning the correct headers, but the actual GET request fails intermittently. Could this be related to how the server handles sessions or cookies? What could be causing the inconsistency, and how can I debug or resolve this scenario effectively? This issue appeared after updating to Javascript 3.9. Has anyone dealt with something similar? Has anyone else encountered this?