I've been googling for Google App Engine Backends code samples but I found nothing. Does anyone know where can I find a tutorial or something?
Thanks.
Looks like it is set to be deprecated on July 30, 2019 while the shutdown date is set for July 30,2020. You may find further details about this here. As for the launcher, we recommend moving to the Cloud SDK for future developments. You may install it here.
Google App Engine provides four possible runtime environments for applications, one for each of four programming languages: Java, Python, PHP, and Go. The environment you choose depends on the language and related technologies you want to use for developing the application.
App Engine uses the Jetty servlet container to host applications and supports the Java Servlet API in version 2.4. It provides access to databases via Java Data Objects (JDO) and the Java Persistence API (JPA).
What in particular are you confused about? The backends documentation in Python and in Java are fairly complete, and there's nothing particularly special about writing code for backends (except as documented there): You simply define request handlers as per usual. It's just like writing a standard webapp, except without a time limit on requests (and the warmup request is guaranteed).
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