Changes with nginx 0.8.1 08 Jun 2009

    *) Feature: the "updating" parameter in "proxy_cache_use_stale" and
       "fastcgi_cache_use_stale" directives.

    *) Bugfix: the "If-Modified-Since", "If-Range", etc. client request
       header lines were passed to backend while caching if no
       "proxy_set_header" directive was used with any parameters.

    *) Bugfix: the "Set-Cookie" and "P3P" response header lines were not
       hidden while caching if no "proxy_hide_header/fastcgi_hide_header"
       directives were used with any parameters.

    *) Bugfix: the ngx_http_image_filter_module did not support GIF87a
       format.
       Thanks to Denis Ilyinyh.

    *) Bugfix: nginx could not be built modules on Solaris 10 and early;
       the bug had appeared in 0.7.56.