HttpProtocolParams.setUseExpectContinue(params, true);
HttpRequestExecutor httpexecutor = new HttpRequestExecutor();
httpexecutor.setParams(params);
// Required protocol interceptors
httpexecutor.addInterceptor(new RequestContent());
httpexecutor.addInterceptor(new RequestTargetHost());
// Recommended protocol interceptors
httpexecutor.addInterceptor(new RequestConnControl());
httpexecutor.addInterceptor(new RequestUserAgent());
httpexecutor.addInterceptor(new RequestExpectContinue());