# how to use the scgi server interface with guile

like fastcgi, scgi is a protocol that connects web servers with other applications.
compared to fastcgi, scgi's full specification is far simpler and it is easier to implement.
compared to cgi, where each request creates a new process and runs application code from the beginning, scgi allows for a server application to initialize once and keep running, saving overhead

* nginx, apache and lighttpd support scgi and i have tested it with all of them
* a scheme implementation is part of [sph-lib](/computer/software/sph-lib.html) [(sph scgi)](http://sph.mn/computer/software/sph-lib/doc/sph-scgi.html)
  * (sph scgi) can use the thread-pool based (sph server) or the guile-fibers based (sph server fibers)
* guile's (web server) seems http-centric and not suitable to build an scgi server.