title: How to redirect URL with HAProxy
body: <p>I need redirect www.foo.com and foo.com to www.bar.com in haproxy, this is my configuration:</p>
  
  <pre><code>frontend  http-in
      bind *:80
  
      acl bar.com hdr(host) -i www.bar.com
      ...
      use_backend     bar.com_cluster if bar.com
      ... 
      redirect prefix http://foo.com code 301 if { hdr(host) -i www.bar.com }
      redirect prefix http://www.foo.com code 301 if { hdr(host) -i www.bar.com }
      ...
  
  backend bar.com_cluster
      balance roundrobin
      option httpclose
      option forwardfor
      server bar 10.0.0.1:80 check
  </code></pre>
  
  <p>I have tried with <code>redirect prefix</code> but don't work, any idea?</p>