Half-hearted REST/HATEOAS reply: this wouldn’t be a problem if you put it in a query parameter (or the body with an appropriate content type to account for URL length restrictions)
This is an explanation of the april 1st XKCD comic checkbox [0], in which you can send an receive messages in morse code via a checkbox. There are many responses and gems hidden inside. For a cheat sheet of what you can do see here: [1]<p>[0] <a href="https://xkcd.com/2445/" rel="nofollow">https://xkcd.com/2445/</a>
[1] <a href="https://www.explainxkcd.com/wiki/index.php/2445:_Checkbox" rel="nofollow">https://www.explainxkcd.com/wiki/index.php/2445:_Checkbox</a>