Doesn't work. I add the webscan.html file then scan again and get an empty response every time. URL is https://www.webscanservice.com/index.php/startscan as well I don't know if that's correct or not.
Not sure why it's front page and getting upvoted when it doesn't do anything at all. Seems like a good idea though if it works, curious to see what sort of things it checks for.