These three are "middleware" frameworks that can adapt CGI (or a stand-alone server, or mod_perl, or FCGI, etc.) to some internal, "unified" structure, more often based on a class hierarchy or a dispatch hierarchy than not. CGI "only" structures its path hierarchy using the file system, and launches a new process for every request, while other protocols have persistent processes between requests.

In reply to Re^2: CGI Replacement Recommendations? by Corion
in thread CGI Replacement Recommendations? by Anonymous Monk

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