VS Code Debugger Freezes When Using wrap_wsgi_app with debugpy

サンプルプロジェクトの main.py、特に 5、6、8 行目から始め、付属の「wsgiref」デバッグ設定を Python 3.13 で起動します。curl でブレークポイント時のフリーズを再現し、その後 wrap_wsgi_app(app) と debugpy の間の相互作用を追跡します。ブレークポイントがソース行にフォーカスし、デバッガーのコントロールが応答し、再開後に HTTP リクエストが完了すれば完了です。

Environment data

• debugpy version: XXX (run import debugpy; print(debugpy.__version__) if uncertain) 1.8.13
• OS and version:
• Python version (& distribution if applicable, e.g. Anaconda):

Virtualenv
Python:         3.13.4
Implementation: CPython
Platform:   linux
OS:         posix
Python:     3.13.4
Path:       /home/tony/.pyenv/versions/3.13.4
Executable: /home/tony/.pyenv/versions/3.13.4/bin/python3.13

• Using VS Code

Actual behavior

• VS Code debugger gets stuck once breakpoint is hit.
• UI does not switch to source code line.
• Debugger controls (Resume, Step Out, etc.) are unresponsive.
• HTTP server hangs (no response).
• However, the VS Code CALL STACK shows status: "PAUSED".

Expected behavior

• Debugger pauses on the specified line and focuses editor on source code.
• Debugger controls should remain fully functional.
• Upon resuming, the HTTP server should respond correctly:

HTTP/1.0 200 OK
Content-Length: 13
Content-Type: text/plain
Date: Wed, 11 Jun 2025 20:54:32 GMT
Server: WSGIServer/0.2 CPython/3.13.4

Hello world!

Steps to reproduce:

1. Clone the sample project: https://github.com/totobest/python-debug-test
2. Setup Python interpreter and install venv (poetry configuration is included)
3. Launch the included "wsgiref" debug configuration..
4. Set a breakpoint on line 5 or 6 of main.py..
5. In a terminal, run: curl -i localhost:8000

Additional Context

• Issue occurs consistently across Python versions 3.9 to 3.13.
• Tested across multiple Python Debugger extension versions (2024.x to latest).
• Works as expected when no breakpoint is set.
• Removing the call to wrap_wsgi_app(app) (line 8) resolves the issue entirely.