jmeter etags and 304 not modified

When testing 304 not modified etag using jmeter you need to add http cache manager and tick use cache control/expires headers.

This did kind of work for me however it looked like to was only doing it for every second request. The solution – update jemeter. Looks like there may be an issue in 3.1 of jmeter. I upgraded to version 4 of jmeter and alls good