It looks like superstatic does not parse out URL-encoded values in URL paths:
$ superstatic &
$ echo foobar > "foo:bar.txt"
$ curl 'localhost:3474/foo:bar.txt'
foobar
$ curl 'localhost:3474/foo%3Abar.txt'
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Error</title>
</head>
<body>
<pre>Cannot GET /foo%3Abar.txt</pre>
</body>
</html>
This also then affects firebase serve.
It looks like
superstaticdoes not parse out URL-encoded values in URL paths:This also then affects
firebase serve.