nginx.conf

http {
    server {
        root /usr/share/nginx/html;
        merge_slashes off;
        listen 80 default_server;
        listen [::]:80 default_server;
        proxy_set_header Connection '';
        proxy_http_version 1.1;
        chunked_transfer_encoding off;
        proxy_buffering off;
        proxy_cache off;
        server_name _;

location ~ ^/cors/? {
    resolver 127.0.0.11 valid=15s;

    # We use $request_uri (the raw, untouched URL) 
    # and grab EVERYTHING after 'u=' until the end of the string ($)
    set $greedy_url "";
    if ($request_uri ~* "[?&]u=(.*)$") {
        set $greedy_url $1;
    }

    if ($greedy_url = "") {
        return 400 "Missing target URL in 'u' parameter";
    }

    # Do NOT pass $host; pass the proxy's host so the weather service 
    # doesn't see "localhost" and reject the request.
    # [also] Forward your browser's identity
    # This "fools" Mesonet into thinking a real person is visiting
    proxy_set_header User-Agent $http_user_agent;
    proxy_set_header X-Requested-With "XMLHttpRequest";
    
    
    proxy_set_header Host $proxy_host;
    proxy_set_header X-Requested-With "XMLHttpRequest";
    add_header X-Debug-Proxy-URL $greedy_url;

    # We pass the greedy URL exactly as it was captured.
    set $backend_url "http://ws4kp-cors-anywhere/$greedy_url";

    proxy_pass $backend_url;
}

        location / {
            add_header "Access-Control-Allow-Origin" "*";
            include  /etc/nginx/mime.types;
            root /usr/share/nginx/html;
            # alias /usr/share/nginx/html;
            autoindex on;
            # index index.html;
            add_header 'X-debug-message' "$uri";
            try_files $uri $uri/ /index.html =404;
        }
    }
}

events { }