On 12/6/20 10:12 AM, L A Walsh wrote: > Since the early 4.x series and now, the cache control headers: > ignore-no-cache > ignore-must-revalidate > ignore-auth > have been "obsoleted". Indicating something has replaced them and > there's a new & better way to ignore those headers for > static files (most often web-fonts, though some javascript files > also fall into that category). AFAICT, the options were _not_ removed because there are new/better options to ignore the corresponding directives. I see how this can be confusing in a classical "obsoletion" context. I will try to clarify: * ignore-no-cache Squid v3.2 release notes imply that Squid does what most admins want now, without any explicit option: "Its commonly desired behaviour is obsoleted by correct HTTP/1.1 Cache-Control:no-cache handling." Commit 7ed5335 message details that claim: https://github.com/squid-cache/squid/commit/7ed5335 * ignore-must-revalidate Squid v4 release notes claim that "Other more HTTP compliant directives (cache, store_miss) can be used to prevent objects from caching". That official statement mismatches the ignore-must-revalidate intent AFAICT: The ignore-must-revalidate intent was to prevent revalidations rather than prevent caching. The corresponding commit message paints a rather different picture by claiming that ignore-must-revalidate was broken -- it was actually preventing caching rather preventing revalidation (and caused other problems): https://github.com/squid-cache/squid/commit/064679e If you combine the two together, you may get something like "the option was removed because it did not do what it promised to do, and what it actually did can be accomplished with cache and store_miss". * ignore-auth Squid v4 release notes imply that Squid does what most admins want now, without any explicit option: "Its commonly desired behaviour is performed by default with correct HTTP/1.1 revalidation". More details at https://github.com/squid-cache/squid/commit/d94cbaa Please do not shoot the messenger -- I am just relaying and interpreting the official information. If you have a specific use case that cannot be addressed using the existing directives, please ask about that specific use case, detailing what Squid receives and what you want Squid to do. HTH, Alex. _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users
