You can use Fiddler on the server or on the client to monitor and capture Web traffic to and from GN4 server and clients.

Using Fiddler on an iPhone

You need to set the Wi-Fi proxy of the iPhone to the computer running Fiddler. Use the default port of 8888.

Then, in Fiddler go to Tools > Options and select Connections. Select Allow remote computers to connect.

The same screen also shows the port Fiddler is listening on.

Download Fiddler