remove the cached connection from the upstream retrying function
Merge branch 'develop' into fix_keepalive_retry
fix client timed out bug.
should not return 500 when client timed out.
bugfix

1. 当读文件请求返回status_msg时（如ds正在升级不能提供服务时）仍使用read_resp_msg去解析会导致解析错误，打印错误的内存数据到log中，并可能导致超时
2. 修改默认的从后端接收buf大小为2M，确保在下载文件返回应答的头时能够获得file_info
3. 在下载原生文件时如果得到了文件的file_info，就在应答头里面加上文件的last-modified时间
4. 修复一些错误的返回值
modify GMT time format from UTC+0800 to GMT
1. fix read corrupted large file bug.
2. remove some redundant code.
Merge pull request #180 from zhcn381/master

nginx-tfs module bugfix
merge changes between nginx 1.2.6 and nginx 1.2.7
added the copyright of NetEase

The upstream check module was developed in NetEase.
Thanks to Netease corpration supporting the opensource modules.
changed the github url of this repository in the README
Merge pull request #189 from yaoweibin/netease

Netease
Merge pull request #188 from cfsego/calibaba

merge changes between nginx 1.2.6 and nginx 1.2.7
updated the README
Merge pull request #193 from zhuzhaoyuan/update-readme2

updated the README
disable 408 response record any access log with empty request.

In SSL application, Chrome browser may establish extra connections
and doesn't send any data. This will cause a 408 record in the access.log.
Now we could disable this meaningless record with directive 'log_empty_request'.
Merge pull request #195 from yaoweibin/log_empty_request_408

disable 408 response record any access log with empty request.
added the retry_cached_connection directive
add session_sticky_modules for tengine
Merge pull request #205 from dinic/session_sticky2

add session_sticky_modules for tengine
added the CHANGES for tengine-1.4.4