I should note that invoking b.cgi from the browser ("/cgi-bin/b.cgi?animal=dog&vegetable=radish") works, giving:

b.cgi query dump:
<ul>
<li><strong>animal</strong></li>
<ul>
<li>dog</li>
</ul>
<li><strong>vegetable</strong></li>
<ul>
<li>radish</li>
</ul>
</ul>
b.cgi argv dump:
[download]