exceptionUnmarshallers = new ArrayList<Unmarshaller<AmazonServiceException, Node>>();
exceptionUnmarshallers.add(new LegacyErrorUnmarshaller());
setEndpoint("ec2.amazonaws.com");
signer = new QueryStringSigner();
HandlerChainFactory chainFactory = new HandlerChainFactory();
requestHandlers = Collections.synchronizedList(chainFactory.newRequestHandlerChain(
"/com/amazonaws/services/ec2/request.handlers"));
client = new HttpClient(clientConfiguration);