Then please use either a more speaking title of your question or - as I asked - describe your use case.
Scraping of Websites is not a strength of a home-automation system.
So either use a switch with an API - or just write a script, which in turn you can access/trigger via openHAB: e.g. a python script, that logs into your switch, opens the PoE page and turns on/off your PoE for a specific port. for that there could be some findings on github - or you have to write it up on your own.
There’s a ton of examples on how to trigger scripts with openHAB: keywords are “exec binding”, “scripts” … this should give you a bunch of inspiriation.