# PATCH Request to Zoom API results in "Invalid CORS Request" **URL:** \ **Category:** Zoom Apps\ **Created:** [October 10, 2022, 6:17pm UTC](https://devforum.zoom.us/t/patch-request-to-zoom-api-results-in-invalid-cors-request/77195 "2022-10-10T18:17:44Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![karen.tan](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/karen.tan/32/40712_2.png) [@karen.tan](https://devforum.zoom.us/u/karen.tan)\ **Post date:** [October 10, 2022, 6:17pm UTC](https://devforum.zoom.us/t/patch-request-to-zoom-api-results-in-invalid-cors-request/77195/1 "2022-10-10T18:17:44Z")
**Zoom Apps Configuration** Based on the Advanced Zoom Apps Sample - [GitHub - zoom/zoomapps-advancedsample-react: This repository contains an Advanced Zoom Apps Sample. It should serve as a starting point for you to build and test your own Zoom App in development.](https://github.com/zoom/zoomapps-advancedsample-react). **Description** _Details on your question, workflow or the problem you’re trying to solve._ I’m having trouble making a PATCH request to the Zoom Meeting API at [https://api.zoom.us/v2/](https://api.zoom.us/v2/) (GET requests through my Zoom App work fine). Just like the reference app, I am using an HTTP middleware proxy to make requests in the backend. Moreover, I am able to make the request with no issues through Postman, so the access token, etc. are correct, but in the Zoom App, I keep getting “Invalid CORS request”. **Error?** 403 Response and “Invalid CORS request”. **Troubleshooting Routes** _The troubleshooting attempt types you’ve already exhausted, including testing with the appropriate sample app (found on [Zoom · GitHub](https://github.com/zoom))._ I’ve already tried adding ` 'Access-Control-Allow-Origin': '*', 'Access-Control-Allow-Methods': '*', 'Access-Control-Allow-Headers': '*'` to the response headers, but the error persists. **How To Reproduce** _Steps to reproduce the behavior._ 1. Start with the Advanced Sample App 2. Create a server route and proxy endpoint to handle any type of requests to [https://api.zoom.us/v2/](https://api.zoom.us/v2/) (make sure to pass the Zoom access token and content-type as headers to the proxy endpoint). 3. Make a PATCH request from the front-end to the proxy endpoint. (logging the response returns a 403 error and logging the response.text() returns “Invalid CORS request”).