Filtered I/O in Apache?

jmallett asks: "I tried using the latest Apache (2.0a7) but I had worse problems with unfiltered IO than I had in 2.0a6. I have a section at the bottom of my page that contains the uptime (generated by an SSI), which showed up only half the time in 2.0a6, and almost NEVER in 2.0a7 (where I had to do it in CGI because SSI seems totally borked). Why is unfiltered IO such an advantage other than it frees up Apache? Unless the pipe is kept open, and the output size determined ahead of time, it doesn't seem like this works for some things. Is there any way to enable filtered IO and SSI in Apache 2.0a7?"