Squid is a high performance Web proxy cache that can be arranged hierarchically for an improvement in response times and a reduction in bandwith usage. Squid runs on all popular Unix and Windows platforms.
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A new version numbering system was added. Minimal squid.conf improvements were made. Native IPv6 support was added. Error pages have been localized. Connection pinning was implemented (for NTLM auth passthrough). Quality of service (QoS) flow support was added. SSL bump was added (for HTTPS filtering and adaptation). eCAP adaptation module support was added. ICAP bypass and retry enhancements were made. ICY streaming protocol support was added.