This chapter described how the App Engine works in terms of scaling and the anatomy of a typical App Engine application. We then turned our attention towards the services that are at the disposal of an App Engine application. We had a brief overview of each one of these services. Next, we moved towards writing a simple web app that would print all the environment variables. Next, we ran it locally and deployed it on the cloud to examine its output and noted a few interesting headers that are added by App Engine.

This understanding of the environment is essential towards mastering Google App Engine. By now, you have a pretty good understanding of the environment under which your code executes. In the next chapter, we are going to examine request handling in detail and check out the options that we have while serving requests.