[置顶] http 请求 response 417 解决方案

http 请求时，有时候会response417错误，只要new httpClient时设置属性即可解决：直接贴代码

1. HttpClient httpClient = new DefaultHttpClient();
   
2. HttpParams httpParams = httpClient.getParams();
   
3. httpParams.setParameter(CoreProtocolPNames.USE_EXPECT_CONTINUE, false);