https://httpd.apache.org/docs/2.4/howto/cgi.html contains a bad link in section "CGI modules/libraries" (this is close to the end of this page) concerning "If you're writing CGI programs in C, there are a variety of options. One of these is the CGIC library, from". The bad link is "http://www.boutell.com/cgic/", ending up at "https://www.boutell.co.uk/bad-credit-loans/", what seems to be a business site, having no thematic connection with CGI. I suggest the thematically proper link: http://web.mit.edu/wwwdev/www/cgic.html which seems to be the proper home of "cgic: an ANSI C library for CGI Programming By Thomas Boutell".
Fixed on trunk in r1878627 and on 2.4.x in r1878628. Slightly updated to use https instead of http. Thx for spotting and reporting it.