Squid Cache（簡稱為Squid）是一個流行的自由軟件（GNU通用公共許可證）的代理服務器和Web緩存服務器。Squid有廣泛的用途，從作為網頁服務器的前置cache服務器緩存相關請求來提高Web服務器的速度，到為一組人共享網絡資源而緩存萬維網，域名系統(tǒng)和其他網絡搜索，到通過過濾流量幫助網絡安全，到局域網通過代理上網。Squid主要設計用于在Unix一類系統(tǒng)運行。Squid的發(fā)展歷史相當悠久，功能也相當完善。除了HTTP外，對于FTP與HTTPS的支持也相當好，在3.0 測試版中也支持了IPv6。

下載：http://bo.mirror.garr.it/mirrors/squid/squid-3.1.0.15.tar.bz2
更多：http://bo.mirror.garr.it/mirrors/squid/
查看ReleaseNote:
http://bo.mirror.garr.it/mirrors/squid/squid-3.1.0.15-RELEASENOTES.html

Changes to squid-3.1.0.15 (23 Nov 2009):

- Regression Fix: myip ACL not accepted in config
- Bug 2795: acl arp lookups including port
- Bug 2794: ESI parsing fails on FreeBSD
- Bug 2778: fix linking issues using SunCC
- Bug 2724: eCAP build failure unless ICAP enabled
- Bug 2628: Correct default PID location to PREFIX/var/run/squid.pid
- Bug 2617: Performance degradation during processing list of dstdomain ACL's
- Bug 2374: Support ICY / ICEcast / SHOUTcast streaming protocol.
- Fix: 64-bit filesize issue in squidclient POST of large files
- Fix: send correct Connection: header on intercepted replies
- Support libtool 2.x
- ESI libraries libexpat and libxml2 now optional
- ESI support default enabled
- Bump libcap minimum requirement to libcap 2.09+
- ARP / MAC support fixes for IPv6-mode
- Add outstanding IPv6 settings to squid.conf (localnet, localhost)
- ... and many additions to the background testing structure
- ... and very many minor build and code cleanups for non-GCC compilers.

【編輯推薦】

1. Linux下Squid代理服務器的架設與維護
2. SQUID祥解
3. FreeBSD上安裝Squid代理服務器