Apache Traffic Server v4.2.2 发布，此版本是最新的稳定版本，现已提供下载。
从 v3.2 版本升级到 v4.x 版本请小心，因为现在缓存不向后兼容，升级请查看升级指导。
Apache Traffic Server 4.2.2 版本将会是 4.x 的最后一个小版本，也是 LTS 版本。
改进记录：
Fix RAT report exceptions.
plugin metrics fail after a crash
Core dump inside openssl library
TS-2859: remove DBG macros to not generate warnings...
TS-2560: regex_remap lowercase substitutions is not...
TS-2867: Remove clock functionality from traffic_shell...
Revert commits that were accidentally pushed.
TS-2879: Remap errors and redirects should honor keep...
TS-2253: PluginVC::process_close Segmentation fault
fix to deal with redirect by remap correctly for instru...
[TS-1981] Adding arbitrary methods to url remap, and...
TS-2497: Memory leak with failed posts
TS-2766: Changing back default hdr heap str size to...
TS-2766 Fix indentation / coding style
TS-2766: HdrHeap::coalesce_str_heaps doesn't properly...
Setting rpath to reference value used when --with-opens...
[TS-2665] Clean up ink_stack_trace_dump code
SSL start as root
Fix internal half closed post bug
Header Quotes patch, dont trim quotes if the field...
Adding small check for non-zero reads
Correct some stat variables
Hide query parameters access log
[TS-2822] Crash in LogBufferIterator::next
TS-2784 Fix build for FreeBSD10
TS-2778: Websockets remap doesn't properly handle the...
TS-2564: Fix race condition when object is in the ram_c...
Add license blurb to trafficserver.service
Add AL2 license to all .po files, makes RAT happy
Traffic Server 是一套快速、模块化的兼容 HTTP/1.1 的反向代理服务器，与 Nginx 和 Squid 类似，目前该项目已经转到 Apache 基金会。
Traffic Server设计的思想是将一个大系统划分为若干个小的子系统，每个子系统负责专门的任务或应用。比如，Event子系统负责提供任务调度服务，Net子 系统负责提供网络服务。每个子系统抽象为一个Processor。这种高内聚低耦合的设计原则使系统具有更好的重用性，维护性和扩展性。例 如，如果hostDBProcessor需要进行DNS解析，可以直接调用dnsProcessor的相关函数，而无需关注DNS解析的细 节；dnsProcessor也只需封装DNS请求和解析DNS应答，和网络相关的功能可以调用netProcessor来完成。
软件详情：https://cwiki.apache.org/confluence/display/TS/What%27s+new+in+v4.2.x
下载地址：http://trafficserver.apache.org/downloads
来自:开源中国社区
