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-3.1.1.tar.bz2
patch: http://bo.mirror.garr.it/mirrors/squid/squid-3.1.1.patch
ReleaseNote: http://www.squid-cache.org/Versions/v3/3.1/RELEASENOTES.html

New features is:

 * Connection Pinning (for NTLM Auth Passthrough)
 * Native IPv6
 * Quality of Service (QoS) Flow support
 * Native Memory Cache
 * SSL Bump (for HTTPS Filtering and Adaptation)
 * TProxy v4.1+ support
 * eCAP Adaptation Module support
 * Error Page Localization
 * Follow X-Forwarded-For support
 * X-Forwarded-For options extended (truncate, delete, transparent)
 * Peer-Name ACL
 * Reply headers to external ACL.
 * ICAP and eCAP Logging
 * ICAP Service Sets and Chains
 * ICY (SHOUTcast) streaming protocol support
 * HTTP/1.1 support on connections to web servers and peers.
  (with plans to make this full support within the 3.1 series)

Changes to squid-3.1.1 (29 Mar 2010):

- Bug 2873: undefined symbol
- Bug 2827: assertion in authentication
- Remove ufsdump binary from default builds
- Remove pinger from default startups
- ... and several documentation updates.