Changes with nginx 0.8.31
*) Feature: now the "error_page" directive may redirect the 301 and 302 responses. （这个特性不错）
*) Feature: the $geoip_city_continent_code, $geoip_latitude, and $geoip_longitude variables.
*) Feature: now the ngx_http_image_filter_module deletes always EXIF
and other application specific data if the data consume more than 5% of
a JPEG file.
*) Bugfix: nginx closed a connection if a cached response had an empty body.
*) Bugfix: nginx might not be built by gcc 4.x if the -O2 or higher optimization option was used.
*) Bugfix: regular expressions in location were always tested in case-sensitive mode; the bug had appeared in 0.8.25.
*) Bugfix: nginx cached a 304 response if there was the "If-None-Match" header line in a proxied request.
*) Bugfix: nginx/Windows tried to delete a temporary file twice if the file should replace an already existent file.
下载地址：nginx-0.8.31，nginx/Windows-0.8.31
