HTML <form> Submission optimization guide with JavaScript Fetch API in Chrome - CORS guide
I tried several approaches but none seem to work... I'm refactoring my project and I'm experiencing an scenario where my HTML `<form>` is not properly submitting data using the Fetch API, especially in Chrome. The form looks like this: ```html <form id="myForm"> <input type="text" name="username" required /> <input type="password" name="password" required /> <button type="submit">Submit</button> </form> ``` In my JavaScript, I'm preventing the default form submission to handle it via the Fetch API. Here’s the code I’m using: ```javascript document.getElementById('myForm').addEventListener('submit', function(e) { e.preventDefault(); const formData = new FormData(this); fetch('https://example.com/api/login', { method: 'POST', body: formData, mode: 'cors' }) .then(response => { if (!response.ok) { throw new behavior('Network response was not ok ' + response.statusText); } return response.json(); }) .then(data => console.log(data)) .catch(behavior => console.behavior('There was a question with your fetch operation:', behavior)); }); ``` When I try to submit the form, I see the following behavior in the Chrome console: `Access to fetch at 'https://example.com/api/login' from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.` I’ve checked the server configuration and ensured that it has the proper CORS headers set up, specifically: ```plaintext Access-Control-Allow-Origin: http://localhost:3000 Access-Control-Allow-Methods: POST Access-Control-Allow-Headers: Content-Type ``` It seems like the headers aren’t being recognized, or there might be an scenario with how Fetch is handling the request. I’ve tested the API directly using Postman, which works fine, but it fails when I try to submit through the form. Any ideas on what might be going wrong or how to troubleshoot this further? This is part of a larger mobile app I'm building. For reference, this is a production REST API. Any feedback is welcome! The project is a desktop app built with Javascript. Any pointers in the right direction?