title: How to make HA Proxy keepalive
body: <p>In my environment I have haproxy load balance for 2 web servers (Apache), this is my HA Proxy configuration :</p>
  
  <pre><code>global
      log         127.0.0.1 local2
  
      chroot      /var/lib/haproxy
      pidfile     /var/run/haproxy.pid
      maxconn     4000
      user        haproxy
      group       haproxy
          tune.ssl.default-dh-param 2048
      daemon
          nbproc      1
      stats socket /var/lib/haproxy/stats
          stats       timeout 1m
          nogetaddrinfo
  listen front
      bind :80
      redirect scheme https if { hdr(Host) -i domain.com } !{ ssl_fc }
  listen front_ssl
      bind :443 ssl crt /opt/certificate/domain.pem
      mode http
          option dontlognull
      stats      enable
      stats      uri /ha?stats
      stats      realm system
      stats      auth root:*********
      stats      refresh 5s
      option http-keep-alive
      option forwardfor
      option redispatch
      reqadd X-Forwarded-Proto:\ https if { ssl_fc }
           timeout client  15s
          timeout connect 3s
          timeout server  15s
          timeout http-request 15s
          timeout http-keep-alive 15s
          default_backend bk_http
  backend bk_http
          mode http
          balance source
          option http-keep-alive
          default-server inter 1s
          retries 3
          timeout connect 3s
          timeout server  15s
          timeout queue 60s
          timeout check 10s
          timeout http-request 15s
          timeout http-keep-alive 15s
          server node1 1.2.3.4:82 check id 1 weight 1 maxconn 2000 maxqueue 2000
          server node2 5.6.7.8:82 check id 1 weight 1 maxconn 2000 maxqueue 2000
  </code></pre>
  
  <p>"KeepAlive On" in /etc/httpd/conf/httpd.conf
  But when I test with curl, I see that keepalive is not work :</p>
  
  <pre><code>curl -Iv http://domain.com 2&gt;&amp;1 | grep -i 'connection #0'
    0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0* Closing connection #0
  curl -Iv https://domain.com 2&gt;&amp;1 | grep -i 'connection #0'
  * Closing connection #0
  </code></pre>
  
  <p>As I know if keepalive is working, result should be :</p>
  
  <pre><code>  0   162    0     0    0     0      0      0 --:--:--  0:00:05 --:--:--     0* Connection #0 to host domain.com left intact
  * Closing connection #0
  </code></pre>
  
  <p>Please let me know if something wrong in my configuration ?</p>