How to Handle CORS Issues When Using Azure Static Web Apps with React?
I'm trying to debug I'm attempting to set up I'm testing a new approach and I'm integrating two systems and I'm currently developing a React application that is hosted on Azure Static Web Apps, and I'm running into CORS (Cross-Origin Resource Sharing) issues when trying to call an API hosted on Azure Functions. The API endpoint is accessible via Postman, but when I attempt to fetch data from it in my React app, I receive the following behavior: ``` Access to fetch at 'https://my-functions.azurewebsites.net/api/myFunction' from origin 'https://my-static-web-app.azurestaticapps.net' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. ``` I've checked the Azure portal, and the Azure Functions app is set up to allow CORS requests from my static web app's URL. Here’s my Azure Functions `host.json` configuration: ```json { "version": "2.0", "extensions": { "http": { "routePrefix": "api", "maxOutstandingRequests": 10, "maxConcurrentRequests": 5 } } } ``` Additionally, I have the following CORS settings in the Azure Functions portal: - Allowed Origins: `https://my-static-web-app.azurestaticapps.net` Despite these configurations, the CORS behavior continues. I’ve also added the following code in my API function to explicitly set CORS headers: ```javascript module.exports = async function (context, req) { context.res = { status: 200, body: { message: 'Hello from Azure Functions!' }, headers: { 'Access-Control-Allow-Origin': 'https://my-static-web-app.azurestaticapps.net', 'Access-Control-Allow-Methods': 'GET, POST, OPTIONS', 'Access-Control-Allow-Headers': 'Content-Type' } }; }; ``` I've also ensured that the correct methods are allowed. I know that the OPTIONS pre-flight request should be handled correctly, but it seems like the headers might not be set correctly. I've tried deploying the function multiple times, clearing my browser cache, and even testing on different browsers, but the scenario still continues. Could anyone provide insight into what might be going wrong? Are there any additional configurations I need to check for CORS to function properly with Azure Static Web Apps and Azure Functions? What are your experiences with this? This is my first time working with Javascript 3.10. Cheers for any assistance! The project is a CLI tool built with Javascript. I'd love to hear your thoughts on this. This is part of a larger CLI tool I'm building.