There are some web sites that are dedicated on that topic. You can read the following among other:

Briefly (I suggest you have already installed PLT Scheme):

on unix (or MacOSX) machines, open a xterm and go to the PLT Scheme installation location (i.e. /your-path/PLT Scheme)

go to the binaries location

cd bin/

start the Scheme web server:

sudo ./web-server -p 8080&

  • Some Scheme servlets examples are in /your-path/PLT SCheme/collects/web-server/default-web-root/servlets/examples/
  • Open a web browser and test your Scheme web server http://localhost:8080/
  • Then, you can run a servlet example: http://localhost:8080/servlets/examples/add.ss
  • You can develop your own servlets and run them (http://localhost:8080/servlets/your-servlets-path/your-script.ss).