I forgot to mention. I'm using the following nginx version:

# nginx -vV
nginx version: nginx/1.2.1
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-log-path=/var/log/nginx/access.log --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --lock-path=/var/lock/nginx.lock --pid-path=/var/run/nginx.pid --with-pcre-jit --with-debug --with-http_addition_module --with-http_dav_module --with-http_flv_module --with-http_geoip_module --with-http_gzip_static_module --with-http_image_filter_module --with-http_mp4_module --with-http_perl_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_stub_status_module --with-http_ssl_module --with-http_sub_module --with-http_xslt_module --with-ipv6 --with-sha1=/usr/include/openssl --with-md5=/usr/include/openssl --with-mail --with-mail_ssl_module --add-module=/tmp/buildd/nginx-1.2.1/debian/modules/nginx-auth-pam --add-module=/tmp/buildd/nginx-1.2.1/debian/modules/chunkin-nginx-module --add-module=/tmp/buildd/nginx-1.2.1/debian/modules/headers-more-nginx-module --add-module=/tmp/buildd/nginx-1.2.1/debian/modules/nginx-development-kit --add-module=/tmp/buildd/nginx-1.2.1/debian/modules/nginx-echo --add-module=/tmp/buildd/nginx-1.2.1/debian/modules/nginx-http-push --add-module=/tmp/buildd/nginx-1.2.1/debian/modules/nginx-lua --add-module=/tmp/buildd/nginx-1.2.1/debian/modules/nginx-upload-module --add-module=/tmp/buildd/nginx-1.2.1/debian/modules/nginx-upload-progress --add-module=/tmp/buildd/nginx-1.2.1/debian/modules/nginx-upstream-fair --add-module=/tmp/buildd/nginx-1.2.1/debian/modules/nginx-dav-ext-module