chromium/src/third_party/blink/web_tests/http/tests/security/mixedContent/resources/simple-event-stream.pl

#!/usr/bin/perl
print "Content-type: text/event-stream\r\n";
print "Access-Control-Allow-Origin: *\r\n";
print "\r\n";
print "data: hello\r\n";
print "\r\n";