I'm creating a webpage with JavaScript and fetch for API requests for an internal use.

My IP is authorized on the server for API request but for the development I use the WebStorm integrated server (on localhost) so when I make a fetch request, the origin in the request headers is set to http://localhost:63342 and the request is blocked because of CORS.

I tried to edit this request in Firefox's Seveloper Tools to set the origin header to my external IP address and it worked great. However I wasn't able to edit it in the JavaScript fetch code.

The used API is Acronis and I can't add localhost, 127.0.0.1 or 192.168.1.13 to the list of authorized IP.

Is there a way to bypass this automatic header or force Firefox to use the external IP instead of the "real one" which is localhost here?