If-Modified-Since header does not works
It does not reseive 304 code. I check it on https://last-modified.com/en/ and https://bertal.ru/index.php?a6[...]i.org/doc/HomePage#h .
In my istallation R5.5.10 I fix it by inserting php code provided on Last-Modified.com to first line of \theme\_common\_header.php
Probably there is more beautiful solution.
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If-Modified-Since header does work
Please read the http class for more details, see
Can't say why the mentioned service don't recognize it.
In the http class there is the comment:
Do we need HEAD support?
Patch for HEAD support: revision:441dadd
But we can't send body for HEAD requests -> Apache will do all the heavy lifting (stripping the response body).
304 code response delay
runfunction there is the following line
which causes the 304 code response delay, I'm currently not sure which purpose that delay serves exactly.