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    <p><strike>you are using py27 with threadsafe environment. in app.yaml you set <code>script: main.app</code> so the code after app is defined is not executed.</p> <p>didn't test it but this should work:</p> <pre><code># create a bare app bare_app = webapp2.WSGIApplication(debug=True) #define the error handlers def handle_401(request, response, exception): logging.exception(exception) response.write("401 Error") response.set_status(401) def handle_403(request, response, exception): logging.exception(exception) response.write("403 Error") response.set_status(403) def handle_404(request, response, exception): logging.exception(exception) response.write("404 Error") response.set_status(404) def handle_500(request, response, exception): logging.exception(exception) response.write("500 Error") response.set_status(500) # add the error handlers bare_app.error_handlers[401] = handle_401 bare_app.error_handlers[403] = handle_403 bare_app.error_handlers[404] = handle_404 bare_app.error_handlers[500] = handle_500 bare_app.router.add((r'/', HomeHandler)) app = bare_app </code></pre> <p></strike> </p> <p><strong>edit</strong>:<br> use self.abort() instead of self.error()<br> <a href="http://webapp-improved.appspot.com/guide/exceptions.html#abort" rel="nofollow">http://webapp-improved.appspot.com/guide/exceptions.html#abort</a></p> <p>you can see the difference in the source code:<br> <a href="http://code.google.com/p/webapp-improved/source/browse/webapp2.py#574" rel="nofollow">http://code.google.com/p/webapp-improved/source/browse/webapp2.py#574</a><br> while self.error() sets the status code but clears the response, self.abort() executes the function that takes care of the error handling.</p>
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    1. COThe same results. The error is displayed as indicated on the terminal but not in the browser.
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    2. COfound the issue. you should use self.abort() instead of self.error()
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    3. COand for the records. it works also if you declare the app like in your original question.
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