I stumbled across this forum and remembered that I did implement my server code on a Spinneret several months ago and you can find the binary and other files in my Tachyon DropBox folder.
In the next few days I will fire up the Spinneret again an update the images for it as there have been several improvements and also the addition of being able to send emails and perform DNS lookup. Then I will put it back online again at pbjtech.net port 81 etc.
This same code runs on the W5200 and W5500 which is implemented in my new little IoT5500 magjack sized module, complete with microSD or 16Mbyte SPI Flash. I want to also add some NTP code so that the system maintains its time from the net instead.