SocketException: OS Error: No route to host, errno = 113,

[sakAlmahdi]

I create an HTTP server on device A,

and send request from device B to device A using HTTP request is successful

after some time I send a request again

This error occurs

SocketException: OS Error: No route to host, errno = 113

but I sent a request from Postman to device A is successful, every time

Why is it from B to A after some time not working, but when testing it on Postman it works

note: device A and B are Android