How to Configure nginx to Allow Cross-Origin Requests

To allow cross-origin requests, add the following to your nginx configuration file:

location / {
    add_header 'Access-Control-Allow-Origin' '*';
    add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
    add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
    if ($request_method = 'OPTIONS') {
        return 204;
    }
}

This configuration allows cross-origin requests from all origins and supports the GET, POST, and OPTIONS methods. The 'Access-Control-Allow-Headers' field specifies the allowed request headers; requests with headers outside this list will be rejected. If the client sends an OPTIONS request, nginx immediately returns HTTP status code 204, indicating that the request is allowed.