Attempt to log in a PAC file (not working)

pac-file-notes.sh

# https://stackoverflow.com/questions/66514500/how-do-i-configure-a-python-server-for-post
# Run a test server on port 8000
python -c 'if 1:
    from http.server import BaseHTTPRequestHandler, HTTPServer

    class handler(BaseHTTPRequestHandler):
        def do_GET(self):
            self.send_response(200)
            self.send_header("Content-type", "text/html")
            self.end_headers()

            message = "Hello, World! Here is a GET response"
            self.wfile.write(bytes(message, "utf8"))
        def do_POST(self):
            print("GOT POST")
            self.send_response(200)
            self.send_header("Content-type","text/html")
            self.end_headers()

            file_length = int(self.headers["Content-Length"])
            input_bytes = self.rfile.read(file_length)
            print(input_bytes)

            print(self.__dict__)
            print(self.headers.__dict__)

            message = "Hello, World! Here is a POST response"
            self.wfile.write(bytes(message, "utf8"))
            print("FINISHED RESPONDING TO POST")

    with HTTPServer(("", 8000), handler) as server:
        server.serve_forever()
'

# --- different terminal 

# Send the above server a test message
curl -H 'Content-Type: application/json' \
      -d '{ "title":"foo","body":"bar", "id": 1}' \
      -X POST \
      0.0.0.0:8000


# Write a PAC file that attempt to do some sort of logging
echo '
function FindProxyForURL(url, host)
{
    var socks_proxy = "SOCKS 127.0.0.1:8080";

    // Attempt to log that this function was used
    fetch("0.0.0.0:8000", {
      method: "POST",
      body: JSON.stringify({
        userId: 1,
        title: "Fix my bugs",
        completed: false
      }),
      headers: {
        "Content-type": "application/json; charset=UTF-8"
      }
    });

    if (shExpMatch(host, "*.google.com")) {
        return socks_proxy;
    }
    return "DIRECT";
}
' > "$HOME"/.config/custom_proxy/proxy.pac

# Manual step: point to PAC file in firefox 
# TODO: can this be scripted with Ubuntu's 24.04 default snap firefox?

# Point to PAC file in the system settings
gsettings set org.gnome.system.proxy autoconfig-url "file:///home/joncrall/.config/custom_proxy/proxy.pac"