This is a simple "Hello World" example on how to run Bottle on Google App Engine using Python 2.7 WSGI Threadsafe.

Bottle ships with a "ready-to-use" GAE adapter, however, this adapter is specific for Python 2.5 which runs as CGI. If you want to run Bottle on Python 2.7 WSGI Threadsafe, you have to avoid running the server:

bottle.run(server='gae')

Instead, just instantiate the Bottle class and assign it to the local variable 'app':

app = Bottle(catchall=False)

By default, all exceptions other than HTTPResponse or HTTPError will result in a 500 Internal Server Error response, so they won’t crash your WSGI server. You can turn off this behavior to handle exceptions in your middleware by setting bottle.app().catchall to False.