> > This is an intentional change in behaviour which comes from upgrading > Squid to perform the HTTP/1.1 protocol properly. > http://squidproxy.wordpress.com/2012/10/16/squid-3-2-pragma-cache-control-no-cache-versus-storage/ > > Please note the detail: > " > When sent on a server response: > > * /Pragma/ in all its forms *has no meaning whatsoever.* It must be > ignored. > > " > > Looking at the above header with my HTTP/1.1 glasses on... > > * it contains HTTP/1.1 tag indicating that the sender supports > HTTP/1.1 > properly. > > * it contains Cache-Control: indicating that an HTTP/1.1 recipient > (ie > Squid 3.2+) MAY store the response for up to 86400 seconds. > > * it contains Date:, Expires: and Last-Modified: headers confirming > what > Cache-Control has just indicated. > eg. Last-Modified + 86400 sec == Date -Age + 86400 sec == > Expires. > ... so all three HTTP/1.0 and HTTP/1.1 methods of calculating > storage > time come up with the 24hr caching permission for Squid. > > * Pragma is not defined by any of the HTTP RFCs and therefore must be > considered to be a Entity header relating to how the end-user agent > (ie > browser) is supposed to display or manage that entity. It is not > supposed to be related to Squid or other HTTP/1.1 proxies. > > Amos > Thanks Amos, more clear now
