Checkbox

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:&#x2F;&#x2F;xkcd.com&#x2F;2445&#x2F;" rel="nofollow">https:&#x2F;&#x2F;xkcd.com&#x2F;2445&#x2F;</a> [1] <a href="https:&#x2F;&#x2F;www.explainxkcd.com&#x2F;wiki&#x2F;index.php&#x2F;2445:_Checkbox" rel="nofollow">https:&#x2F;&#x2F;www.explainxkcd.com&#x2F;wiki&#x2F;index.php&#x2F;2445:_Checkbox</a>

Use blank for dot and tab for space.<p>Then your morse code is &quot;invisible&quot; and you can put it anywhere.