[Bug]: Flask Server in Termux Requires Focus Switch to Process Requests

[Postaczech2021]

Problem description

I'm encountering a strange issue when running a Flask server within Termux on Android. Specifically, when I access the server via 127.0.0.1:5000 in Chrome, the request seems to hang. The browser just waits indefinitely. The request is only processed after I switch back to the Termux app, and then immediately switch back to Chrome. It's as if Termux needs focus to actually process the request from the Flask server. This behavior is obviously undesirable, as I don't want to manually switch between apps for every request.

Has anyone else experienced this? Is it possible that this behavior is due to new security policies implemented in Android 15 (or later versions of Android)?

Steps to reproduce the behavior.

I'm encountering a strange issue when running a Flask server within Termux on Android. Specifically, when I access the server via 127.0.0.1:5000 in Chrome, the request seems to hang. The browser just waits indefinitely. The request is only processed after I switch back to the Termux app, and then immediately switch back to Chrome. It's as if Termux needs focus to actually process the request from the Flask server. This behavior is obviously undesirable, as I don't want to manually switch between apps for every request.

Has anyone else experienced this? Is it possible that this behavior is due to new security policies implemented in Android 15 (or later versions of Android)?

What is the expected behavior?

Without switch between termux and Chrome browser

System information

• Termux application version:
• Android OS version:
• Device model: