Squid Cache（简称为Squid）是一个流行的自由软件（GNU通用公共许可证）的代理服务器和Web缓存服务器。Squid有广泛的用途，从作为网页服务器的前置cache服务器缓存相关请求来提高Web服务器的速度，到为一组人共享网络资源而缓存万维网，域名系统和其他网络搜索，到通过过滤流量帮助网络安全，到局域网通过代理上网。Squid主要设计用于在Unix一类系统运行。Squid的发展历史相当悠久，功能也相当完善。除了HTTP外，对于FTP与HTTPS的支持也相当好，在3.0 测试版中也支持了IPv6。

下载：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.

【编辑推荐】

1. Linux下Squid代理服务器的架设与维护
2. SQUID祥解
3. FreeBSD上安装Squid代理服务器