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The ETag header is causing an issue with browser cache not being updated when the server has been updated. Actually a weak ETag, see http://en.wikipedia.org/wiki/HTTP_ETag

Seems like tomcat’s DefaultServlet will only serve weak ETag’s even though tomcat7+ does have code for strong ETag but is never used and there is no documentation on how to set it

A possible solution is to remove If-None-Match request header and ETag response header in apache http server

RequestHeader unset If-None-Match

Header unset ETag

How measure the durations of SQL queries

In Ofbiz if a query takes more then 150 ms it shows its duration is shown in log. To change that look for:

Debug.logTiming("Ran query in "

in GenericDAO.java