send 404 if file not found instead of stalling
send 404 if file not found instead of stalling

antonleykin/InteractiveShell,antonleykin/InteractiveShell,fhinkel/tryM2,fhinkel/InteractiveShell,YueRen/tryM2,fhinkel/InteractiveShell,fhinkel/tryM2,YueRen/tryM2,YueRen/tryM2,fhinkel/InteractiveShell,antonleykin/InteractiveShell,fhinkel/tryM2,fhinkel/InteractiveShell,fhinkel/tryM2