I want searched internet found no answers regarding this topics , for example suppose a app is installed on my phone and i want to see which server or sites app is accessing in background or foreground because url is hidden in such apps.
If your device is rooted then you can try this one:
u can use httpcanary or netcapture/netkeeper
If you have enough resources(Computer) Use WIRESHARK(Network Monitoring Tool) to analyze the data sent and received.
If you don’t have a laptop/Computer you have to root your android and use the method described above.