# First set the PHP_ENGINE cookie if not present in the request.                                                                                                                                                   
# We stick to HHVM for now                                                                                                                                                                                         
SetEnvIf Cookie "PHP_ENGINE=.*" session_cookie_set                                                                                                                                                                 
RequestHeader append Cookie "PHP_ENGINE=.HHVM; path=/;" !session_cookie_set                                                                                                                                        
<Proxy "fcgi://backend">                                                                                                                                                                                           
    BalancerMember "fcgi://127.0.0.1:9000" route="HHVM"                                                                                                                                                            
    BalancerMember "fcgi://127.0.0.1:8000" route="PHP"                                                                                                                                                             
    ProxySet stickysession=PHP_ENGINE                                                                                                                                                                              
</Proxy>