upstream keepalive + Host override : problem?

Mon, 29 Apr 2013 03:53:35 -0700 

Добрый день,

Конфиг у меня выглядит вот так:

upstream playapp {
  server …:9000;
  keepalive 16;
}

server {
  listen ... ssl;
  server_name …;

  proxy_set_header Host $server_name;

  location / {
    limit_conn byConn 14;
    limit_req zone=byReq burst=50;

    proxy_pass http://playapp;
    proxy_http_version 1.1;
    proxy_set_header Connection "";
  }
}

Проблема:

2013/04/29 14:19:02 [debug] 21900#0: *1013606439 http proxy header:
"GET /pic/2034583 HTTP/1.1
Host: playapp
Cache-Control: max-age=0
Pragma: no-cache
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_3) AppleWebKit/537.31 
(KHTML, like Gecko) Chrome/26.0.1410.65 Safari/537.31

Т.е. на бэкенд уходит "Host: playapp" вместо "Host: $server_name". Если убрать 
proxy_http_version и proxy_set_header Connection, все нормализуется, бэкенд 
видит "Host: $server_name"

# nginx -V
nginx version: nginx/1.2.6
TLS SNI support enabled
configure arguments: --prefix=/usr/share/nginx 
--conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log 
--http-client-body-temp-path=/var/cache/nginx/body 
--http-fastcgi-temp-path=/var/cache/nginx/fastcgi 
--http-log-path=/var/log/nginx/access.log 
--http-proxy-temp-path=/var/cache/nginx/proxy 
--http-scgi-temp-path=/var/cache/nginx/scgi 
--http-uwsgi-temp-path=/var/cache/nginx/uwsgi --lock-path=/var/lock/nginx.lock 
--pid-path=/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-ipv6 
--with-sha1=/usr/include/openssl --with-md5=/usr/include/openssl 
--without-mail_pop3_module --without-mail_imap_module 
--without-mail_smtp_module 
--add-module=/usr/src/nginx-1.2.6/debian/modules/nginx-echo 
--add-module=/usr/src/nginx-1.2.6/debian/modules/nginx-upstream-fair 
--add-module=/usr/src/nginx-1.2.6/debian/modules/nginx-cache-purge

С уважением,
Александр
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