Changes to squid-3.5.21 (08 Sep 2016):
- Bug 4563: duplicate code in httpMakeVaryMark
- Bug 4542: authentication credentials IP TTL updated incorrectly
- Bug 4534: assertion failure in xcalloc when using many cache_dir
- Bug 4428: mal-formed Cache-Control:stale-if-error header
- Bug 3025: Proxy-Authenticate problem using ICAP server
- Fix segfault via Ftp::Client::readControlReply()
- Fix SSL-Bump failure results in SEGFAULT
- HTTP/1.1: MUST always revalidate Cache-Control:no-cache responses
- HTTP/1.1: do not allow Proxy-Connection to override Connection header
- SSL: CN wildcard must only match a single domain component [fragment]