Changes with nginx 0.8.31 23 Dec 2009

    *) Feature: now the "error_page" directive may redirect the 301 and 302
       responses.

    *) Feature: the $geoip_city_continent_code, $geoip_latitude, and
       $geoip_longitude variables.
       Thanks to Arvind Sundararajan.

    *) 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.
       Thanks to Piotr Sikora.

    *) Bugfix: nginx might not be built by gcc 4.x if the -O2 or higher
       optimization option was used.
       Thanks to Maxim Dounin and Denis F. Latypoff.

    *) 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.
       Thanks to Tim Dettrick and David Kostal.

    *) Bugfix: nginx/Windows tried to delete a temporary file twice if the
       file should replace an already existent file.