[issue26299] wsgiref.util FileWrapper raises ValueError: I/O operation on closed file.

Changes by SilentGhost : -- nosy: +pje versions: +Python 3.6 -Python 3.4 ___ Python tracker ___

[issue26299] wsgiref.util FileWrapper raises ValueError: I/O operation on closed file.

New submission from Samwyse: While developing, I am using wsgiref.simple_server. Using to serve static content isn't working. The attached program demonstrates the issue. Run it and connect to http://127.0.0.1:8000/. You will see three buttons. Clicking on 'wsgi.filewrapper' causes the