drawio/war/WEB-INF/appengine-web.xml

<?xml version="1.0" encoding="UTF-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
	<application>drawdotio</application>
	
	<!-- Configure java.util.logging -->
	<system-properties>
		<property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
	</system-properties>

	<sessions-enabled>false</sessions-enabled>
	<threadsafe>false</threadsafe>

	<!-- Path patterns not supported in production -->
	<static-files>
	    	<include path="/**">
			<http-header name="Access-Control-Allow-Origin" value="*"/>
	    	</include>
	</static-files>

	<instance-class>F2</instance-class>
	<automatic-scaling>
    	<min-idle-instances>1</min-idle-instances>
    	<max-idle-instances>1</max-idle-instances>
	</automatic-scaling>
</appengine-web-app>