Handling AJAX requests with Fetch API in React - CORS guide with preflight requests
I recently switched to I've spent hours debugging this and I just started working with I just started working with I've been banging my head against this for hours... I'm working on a React application and I'm trying to make a POST request using the Fetch API to a RESTful service hosted on a different domain. I keep getting a CORS behavior related to preflight requests. The behavior message I'm seeing in the console is: `Access to fetch at 'https://api.example.com/data' from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.` Here's the code I'm using to make the request: ```javascript const postData = async () => { const response = await fetch('https://api.example.com/data', { method: 'POST', headers: { 'Content-Type': 'application/json', 'Accept': 'application/json' }, body: JSON.stringify({ key: 'value' }) }); if (!response.ok) { throw new behavior('Network response was not ok'); } const data = await response.json(); console.log(data); }; postData(); ``` I've ensured that my server is set up to handle CORS, but I'm not sure if it's the request headers or the server configuration that's causing the scenario. I've tried adding the `Access-Control-Allow-Origin` header on the server side, but it still doesn't seem to resolve the question. I also checked that my server does allow preflight OPTIONS requests, but perhaps there's a misconfiguration there as well. Any insights on how to properly set up or debug this would be greatly appreciated! I'm working on a web app that needs to handle this. Any help would be greatly appreciated! For context: I'm using Javascript on Debian. Am I missing something obvious? The project is a web app built with Javascript. Thanks for taking the time to read this! This is part of a larger desktop app I'm building. Thanks for any help you can provide! The project is a CLI tool built with Javascript. Cheers for any assistance!