We will consider breaking the link between web server and EMS and let the sys admin do his magic. It implies that he knows what he is doing.
But, officially, we will only support apache because we have encountered some problems in the past with other web servers like nginx and lighttpd. The most critical one was encountered few days ago. Please read this link:
This renders nginx completely useless without modifying the configuration file, so out-of-the-box experience is simply ruined.