helloworld.pl
#!/usr/bin/perl
print "Content-Type: text/html\n\n";
print "<?xml version=\"1.0\" encoding=\"iso-8859-1\"?>\n";
print "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.1//EN\"\n";
print "\"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd\">\n\n";
print "<html xmlns=\"http://www.w3.org/1999/xhtml\" xml:lang=\"en\">\n\n";
print "<head>\n";
print " <title>Hello, World!</title>\n";
print "</head>\n\n";
print "<body>\n\n";
print "<h1>Hello, World!</h1>\n\n";
print "<p>Hello, World!</p>\n\n";
print "</body>\n\n";
print "</html>\n";