def testserver(self,server):
		if server.ssl:
			prefix = "https://"	
		else:
			prefix = "http://"
		try:
			url = prefix + "%s" % server.serverdomain
			result = urlfetch.fetch(url, headers = {'Cache-Control' : 'max-age=30'}, deadline=10 )
		except DownloadError:
			if server.falsepositivecheck:
				self.serverisdown(server,000)
			else:
				server.falsepositivecheck = True
				server.put()
		else:
			if result.status_code is not 500:
				self.serverisdown(server,result.status_code)
			else:
				self.serverisup(server,result.status_code)
dataset/ETHPy150Open infincia/AEServmon/checkservers.py/CheckServers.testserver/operator `==` -> `is not`