Request Attributes When Using Application Zones 

You can retrieve information about the application zone that the current request belongs to (when application zones are being used on the J2EE Engine) in your servlet code. You retrieve them as request attributes using the getAttribute(String s)method of the HttpServletRequest object.

The following three attributes are available to servlet developers:

Attribute Name	Value
com.sap.servlet.separator.zone	Contains the string that is used as a separator between the application alias name and the zone name.
com.sap.servlet.request.alias	Contains the alias name of the application (without a zone identifier attached to it).
com.sap.servlet.request.zone	Contains the application zone name that the request belongs to.