I use apache on 0S4 quite regularly for testing php webcode, It works well for a while. Then I start to find that images and other emebeded obects in the page start getting "stuck" the conection is made but the file somehow never served. So for testing with regular resets it works well, but for real server usage, not at the moment.
68k apache wroked better I recall but it's along time since I used that, still only for local testing, as my A1200 was always on dialup.
Maybe it's related to the PHP? I use Apache on OS4 24/7/365, just for serving family photos to a small number of family and friends, but only with static HTML or even just Apache's "raw" dir listings. I rarely see such problems. I do reboot on average once a day, I guess, either to install new betatest material or test translated catalogs (I'm an OS4 beta tester and translator) or for other similar reasons. But in between reboots Apache just runs happily in the background for up to several days.
I also run a Samba server on the same machine for a couple of other local machines (my wife's Win XP laptop and my Linux/Oracle Enterprise database server -- which is just an old PC I installed CentOS 5 and Oracle Enterprise 11g on for fun). Samba is also working quite well with no interference needed and no disturbances felt.
For HTTP, there is also BlackWidow on os4depot. Lightweight, works like a charm, and very easy to setup with its own GUI, I sometimes use it to serve files like photos on my PC.
Unfortunately we're still missing an up to date MySQL port (don't know if the older 68k ones work, because I never tried), which means that you can't run most CMS systems on Amiga OS 4.
I want to use the server to keep images and text files for my manager program. So i can just find the files on the server,so people only need to download the exe file and not all the images and text files aswell.