Github user yasserzamani commented on the issue:
https://github.com/apache/struts/pull/125
@aleksandr-m , not me but my workmate has used it as an ID for each jsp. I
do not know his work details but in general, he then uses this ID to decide
where he should place the result after an AJAX call. For example a parent jsp
that have div1, div2 and div3 calls an AJAX then if result was from
'/APP/jsp/customer/error.jsp' the it puts the result in div3, if result was
from '/APP/jsp/customer/payment.jsp' the it puts the result in div1, if result
was from '/APP/jsp/customer/free.jsp' the it puts the result in div2.
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