The source code of hello.pl :
<![CDATA[
#!/usr/bin/perl
# HTTP Header for the server: note two newlines
print "Content-type: text/html\n\n" ;
# HTML header for the browser
print "<!DOCTYPE HTML PUBLIC "
."\"-//W3C//DTD HTML 4.0//EN\">\n" ;
print "<HTML>\n" ;
print " <HEAD>\n" ;
print " <TITLE>Hello</TITLE>\n" ;
print " </HEAD>\n" ;
print " <BODY>\n" ;
print " <H1>Hello</H1><HR>\n" ;
print " Hello, and goodbye\n" ;
print " </BODY>\n" ;
print "</HTML>\n" ;
]]>