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chromium/third_party/blink/web_tests/http/tests/misc/error404.pl 

#!/usr/bin/perl
# Simple script to generate a 404 HTTP error

print "Status: 404 Not Found\r\n";
print "Content-type: text/html\r\n";
print "\r\n";

print "<html><body>";
print "This 404 error was intentionally generated by a test script.";
print "</html></body>";