How to disable CORS policy in POST API in web dev module

I get this error every time I try to access my POST endpoint in the Ignition Web dev module.

Access to fetch at '' from origin 'http://localhost:8668' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

And this is my code on the client side:

url = ""

data = { 'nestedResponse': false,
         'paths': [ {'recursive': false, 'path': '[default]SIM/realistic'},
                    {'recursive': false, 'path': '[default]SIM/ramp 1'} 
fetch(url, {
                mode:   'no-cors',
                method: 'POST',
                headers: {'Content-Type': 'application/json'},
                body: JSON.stringify(data)
    .then(res => res.json())
    .then(data => {
                        for (const tag in data.values) {

As I understand I need to disable the CORS policy mode in server side but I dont know how to do that.

There doesn’t appear to be an easy way to do this, still.

You have to manipulate the response headers yourself instead.