LayoutTests/http/wpt/prefetch/resources/main-resource-redirect-no-prefetch.py - WebKit - Git at Google

 def main(request, response):
     headers = [("Content-Type", "text/html")]

     document = """
 <!DOCTYPE html>
 <script>
   window.opener.postMessage('{result}', '*');
 </script>
 """.format(result=request.headers.get("Purpose", ""))

     return headers, document
	def main(request, response):
	headers = [("Content-Type", "text/html")]

	document = """
	<!DOCTYPE html>
	<script>
	window.opener.postMessage('{result}', '*');
	</script>
	""".format(result=request.headers.get("Purpose", ""))

	return headers, document