Handling CORS Issues in React While Fetching Data from REST API in CI/CD
Hey everyone, I'm running into an issue that's driving me crazy... Currently developing a React application that communicates with a REST API, I've run into persistent CORS issues during my CI/CD pipeline execution. While the app works fine in local development, I'm facing access-control-allow-origin errors when I deploy to our staging environment. The API is hosted on a different domain, and the backend is built with Express.js. For my React app, I'm using version 17.0.2. Here's a simplified version of my fetch request: ```javascript async function fetchData() { try { const response = await fetch('https://api.example.com/data'); if (!response.ok) { throw new Error('Network response was not ok'); } const data = await response.json(); console.log(data); } catch (error) { console.error('Fetch error:', error); } } ``` On the Express side, I've added the CORS middleware: ```javascript const cors = require('cors'); app.use(cors()); ``` Despite these configurations, the CORS policy seems to block requests when I push my code to the CI/CD pipeline, specifically in the staging phase. Locally, everything works as expected because I have a proxy setup in my `package.json`: ```json "proxy": "http://localhost:3001" ``` This approach doesn't translate well in the CI/CD environment. I attempted adding allowed origins in the CORS configuration by specifying `origin: '*'`, but it hasn't resolved the issue. Additionally, I've checked the network tab in my browser’s dev tools and confirmed that the preflight OPTIONS request returns a 403 Forbidden. Could the CI/CD environment configurations or the API deployment settings be influencing this? Is there a way to set up my React application, such that CORS issues are bypassed in staged environments? Any advice or configuration examples would be greatly appreciated. I'm working on a API that needs to handle this. I'd really appreciate any guidance on this. I'm using Javascript LTS in this project.