Here’s a simple example of the XML required to set up a backend:
<backends>
<backend name="worker">
<class>B2</class>
<options>
<dynamic>true</dynamic>
<public>true</public>
</options>
</backend>
</backends>
This sets up a B2 class backend named worker which can be addressed at the URL worker . APPLICATION-ID . appspot . com . Save this as backends.xml in the /war/WEB-INF/ directory.