mod_lisp and FastCGI are just two Apache modules that I know of that can work at this time. mod_lisp provides schema support because the architecture is similar to FastCGI, where CGI parameters like parameters are passed through a socket to a second process that remains running as the backend of the schema on the web server. Basically, you use one or the other to send CGI-like parameters via a socket to the executable server of the circuit.
You can find information about these solutions here . There was another FastCGI effort called SCGI that demonstrated a simple Scheme SCGI receiver called a gambit. This code is probably no longer supported, but a receiver circuit may be useful.
Back in Apache 2.0 days, there were more projects playing with circuitry and clips. I do not believe that mod_scheme has ever released anything, but if they did, then it is incompatible with modern releases of Apache.
Edwin buck
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