@terziyski  ok, there is my update.

first time i connect thru phone i am connecting as proxy or smh, i do not understand exactly but in this type of connection i cannot go to router settings from device via 192.168.0.1. btw i can modify device connection after proxy-connection to be dhcp connection. then, i can go to router settings using 192.168.0.1 on device. althrough i cannot connect to the server created on pc via python -m http.server using address 192.168.0.100:8000 from device, pretty sure this is my pc ip address ( my device address is 192.168.0.101 ). when i try to connect from device i have same connection-timeout error. connection on 192.168.0.101, localhost:8000 from device gives "connection is refuced". 192.168.0.100:8000, localhost:8000 from pc is ok. what may cause this scenario?

@kotya That web server runs only on localhost.

Of course you wont be able to connect to it from another device/PC.

Set the server to bind to 0.0.0.0 or your LAN address, if you want to access it via LAN.

@ku4eto

>That web server runs only on localhost

i do not understand actually why server runs only on localhost ( and how localhost differs from lan ), terminal says "Serving HTTP on 0.0.0.0 port 8000 (http://0.0.0.0:8000/) ...", but you are correct, i tried to run server using "npx http-server" and now it just works

thank you very much for helping me out (シ_ _)シ  @terziyski and @ku4eto