Directivas - HostnameLookups - <IfDefine>

HostnameLookups:
HostnameLookups on|off|double

<IfDefine>: 
  <IfDefine ReverseProxy>
    LoadModule rewrite_module libexec/mod_rewrite.so
    LoadModule proxy_module   libexec/libproxy.so
  </IfDefine>