WSGIApplication()'s debug=True option does not work about webapp-improved HOT 7 CLOSED

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[deleted comment]

This issue was closed by revision da20281cbba3.

It appears that this bug is back - unless revision da20281cbba3 hasn't been 
incorporated yet in the sdk (?)

Steps to reproduce: introduce any syntax error into any request handler, such 
as the "hello world" one in "Getting started" for python27

Expected output: stack trace
Actual output: http 500 internal sever error (on localhost server). Haven't 
tried it on app engine production server

Versions: SDK 1.0.7 06-26-2012 for Windows; python 2.7.3 Windows; Windows 7 up 
to date as of July 15 2012; Chrome latest.

Things I tried: Substituting the whole folder of the downloaded webapp2 at 
appengine/lib directory, for webapp2 2.5.1. Result: it gives server error even 
for correct handlers

Please help -- is there any workaround?  

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[deleted comment]

This seems to have popped up again in Google App Engine 1.9.17 - see 
https://code.google.com/p/googleappengine/issues/detail?id=11557