AWS API Gateway CORS Misconfiguration with Lambda Proxy Integration in Node.js
Hey everyone, I'm running into an issue that's driving me crazy. I'm getting frustrated with I'm working with a CORS scenario with my AWS API Gateway that uses Lambda proxy integration with a Node.js backend. My API is supposed to return JSON data, but when I make a request from a frontend application, I'm getting a CORS behavior in the browser console: `Access-Control-Allow-Origin missing`. I've set up CORS in the API Gateway settings, but it still seems to be misconfigured. Here's the relevant part of my Lambda function code: ```javascript exports.handler = async (event) => { const response = { statusCode: 200, headers: { 'Content-Type': 'application/json', 'Access-Control-Allow-Origin': '*', // I'm trying to allow all origins 'Access-Control-Allow-Methods': 'OPTIONS,POST,GET', }, body: JSON.stringify({ message: 'Hello, world!' }), }; return response; }; ``` I have also added a CORS configuration in the API Gateway console by enabling CORS on the methods, and it seems to be generating the correct OPTIONS response. However, when I test the API from Postman, it works fine, but from the browser, I still get that CORS behavior. I've checked that my Lambda function is deployed correctly and associated with the right endpoint in API Gateway. I’ve even tried redeploying the API and clearing the cache in my browser, but the scenario continues. What could I be missing? This is part of a larger application I'm building. Has anyone else encountered this? Cheers for any assistance!