Efcgi is an implementation of fast CGI for Erlang that is built around tcpip. It fully embraces fast cgi and makes no attempt to try and emulate cgi. So instead of connecting up the incoming stderr/stdout with streams it calls a callback that you provide with the relevant data. You may use this as the entry point for your system turning the incoming parms and data into messages idiomatic to your application.
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At one point, Open Hub analyzed source code for this project based on code location(s) available at that time. Since then, the code locations have been removed.