title: Missing Content-Length header when using Nginx + Gzip + Unicorn
body: <p>I don't know why http response is missed "Content-Length header" when I use gzip in nginx, i'm really getting stuck,please somebody help me, thank you so much!
  this is my config file,</p>
  
  <p><strong>nginx.conf</strong></p>
  
  <p>user nobody nobody ;
      worker_processes  8;</p>
  
  <pre><code>events {
      worker_connections  1024;
      accept_mutex on; # "on" if nginx worker_processes &gt; 1
      use epoll; # enable for Linux 2.6+
  }
  
  http {
      include       mime.types;
      default_type  application/octet-stream;
      log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                        '$status $body_bytes_sent "$http_referer" '
                        '"$http_user_agent" "$http_x_forwarded_for"';
      upstream backend-unicorn {
          server unix:/tmp/unicorn_app.sock fail_timeout=0;
          #server localhost:5000;
      }
      #access_log  logs/access.log  main;
      sendfile        on;
      keepalive_timeout  100;
      gzip on;
      gzip_static on;
      gzip_proxied any;
      gzip_http_version 1.1;
      gzip_comp_level 6;
      gzip_min_length  1100;
      gzip_buffers 16 8k;
      gzip_types text/plain application/zip text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript image$
  
      server {
          listen       8080;
          server_name  misago;
          access_log  /var/log/nginx/unicorn.access.log  main;
          client_max_body_size 64M;
          location /uploads/ {
              root /usr/local/rails_apps/me_management_tool/current/public/uploads;
              break;
          }
          error_page   500 502 503 504  /50x.html;
          location = /50x.html {
              root   html;
          }
  
      }
  
  }
  </code></pre>