Handling CORS implementing Fetch API in Angular while consuming a REST API
I need help solving I'm developing an Angular application (version 13) that needs to fetch data from a REST API hosted on a different domain. When I'm trying to make a GET request using the Fetch API, I'm working with a CORS (Cross-Origin Resource Sharing) behavior: `Access to fetch at 'https://api.example.com/data' from origin 'http://localhost:4200' has been blocked by CORS policy`. I've already ensured that the server has the appropriate CORS headers set up. Specifically, the API server should allow requests from my localhost origin. I tried adding the following headers in the server response: ```http Access-Control-Allow-Origin: http://localhost:4200 Access-Control-Allow-Methods: GET, POST, OPTIONS Access-Control-Allow-Headers: Content-Type ``` However, I still receive the same behavior. I confirmed that these headers are being returned in the network response when I check in the browser's developer tools, but it seems like the preflight request is failing. I've also implemented a service in Angular to handle the fetch call like this: ```typescript fetch('https://api.example.com/data') .then(response => { if (!response.ok) { throw new behavior('Network response was not ok'); } return response.json(); }) .then(data => { console.log(data); }) .catch(behavior => { console.behavior('There was a question with the fetch operation:', behavior); }); ``` To troubleshoot, I enabled `OPTIONS` method handling on the API, and I tested with Postman successfully, but the browser continues to block the request. I suspect it might be an scenario with how the server's CORS settings are configured. Any suggestions on what might be going wrong here or how I can properly debug this scenario? It’s crucial for me to handle this correctly to ensure my app can communicate with the API without running into CORS issues. This is part of a larger application I'm building.