I am looking for a way to do two things in particular. The first is the be able to have a way to direct HTTP POST's to a program's stdin with arguments and to then take its stdout and put that back in the stream being uploaded, and then to apply this to a flex/bison program or module. This is to handle 300GB files without saving them to disk, but still getting the important information out of them. Having the general stdin/stdout part is also because I think this should be more generalized for uploads and downloads in general so things like streaming video become less of a problem.
Apache does not have their modules set up in such a way as to feasibly do this without a whole new major revision. Looking at nginx, it looks closer but I'm still not expert enough to know without help.