The code posted below is just me trying to get something to work, it is giving an internal server error.

That's because it doesn't compile:

$ perl -cw 11111940.pl 
Status: 500
Content-type: text/html

<h1>Software error:</h1>
<pre>syntax error at 11111940.pl line 16, near &quot;'&lt;h1&gt;Woohoo
+oo!&lt;/h1&gt;':&quot;
11111940.pl had compilation errors.
</pre>
<p>
For help, please send mail to this site's webmaster, giving this error
+ message 
and the time and date of the error.

</p>
[Tue Jan 28 12:12:01 2020] 11111940.pl: syntax error at 11111940.pl li
+ne 16, near "'<h1>Woohoooo!</h1>':"
[Tue Jan 28 12:12:01 2020] 11111940.pl: 11111940.pl had compilation er
+rors.
[download]

If you fix your punctuation you might have better luck.