Check Network requests happening from iPad without any proxy setting changes
It is not possible to do so directly on the iPad without using a proxying or VPN app such as Charles.

Instead you'll need to use tools on the network itself to inspect and check the network request from your app. You can use standard tools such as a PC/Mac with Wireshark connected to the same ethernet segment to inspect the packages. Note that most apps today use encrypted communication. As it is your own app, you might have the option to disable encryption or you have the encryption keys from the server, so that you can decrypt traffic within Wireshark.