In the 1.7.6 release of App Engine, we’ve included a major upgrade to the Development Server in the Python SDK, designed to make development faster and to more closely reproduce the production App Engine runtime environment. The new version more faithfully simulates elements of the production App Engine environment, such as concurrent requests and backends, and in most cases this will also mean your apps run faster. We previously included this in the 1.7.5 release as 'dev_appserver2.py'. In this release it has become the default dev_appserver.py, and the older version is now named 'old_dev_appserver.py'.
Some things work a little differently with the new dev_appserver. For example, your local development admin console will run on its own server and port, rather than under /_ah/admin.
See the linked forum post for more detail.
The documentation for the new dev_appserver is here:https://developers.google.com/appengine/docs/python/tools/devserver ,
and this page has a summary of the changes in the command-line arguments from the old version: http://goo.gl/CfREk .
If you encounter any issues with the new Development Server, we encourage you to report them on our issue tracker (http://goo.gl/xfZv1).
https://plus.google.com/117105793163182226623/posts/GB7zYyVuLBG
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