title: Haproxy solr healthcheck with authentication
body: <p>here is my config file</p>
  
  <pre><code>listen  solr 0.0.0.0:8983
  mode http
  balance roundrobin
  option httpchk GET "/solr/select/?q=id:1234" HTTP/1.1
  server solr_slave 1.1.1.1:8983 maxconn 5000 weight 256 check
  server solr_master 2.2.2.2:8983 maxconn 5000 weight 1 check
  </code></pre>
  
  <p>the problem is that my solr server is protected using basic http password authentication and hence the health check fails always</p>
  
  <p>how do i tell haproxy to use those credentials during the health checks?</p>