When self-hosting, you may run into a [CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS) error when trying to run your app on [https://localhost:3000](https://localhost:3000/). If you do, you will need to ensure that you have set [https://localhost:3000](https://localhost:3000/) as an allowed origin on your server.

To do so, you will need to add it to the `allowedOrigins` field on your server config settings. By default, the only allowed origin is `[apiBaseUrl].com`, but you can add more in a comma-separated list. For more details, see the [Config Settings docs](/content/docs/self-hosting/server-config/index.html).

Allow All Origins

To give all origins access to make [CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS) requests, you can use the special allow all case by setting: `allowedOrigins: '*'`.