在获得JSON文件之前，如何构建正确的连接以获得503服务器错误

I was trying several days to get HTTPS connection right to connect to Yobit public API. I don't know what happen to my code. I have tried so many different examples but nothing works out on Yobit. Those codes and examples I have tried, they either give 411, 503 error or MalFormException:no protocol. Can anyone help me? I have very limited experience with HTTPS or web programming on Java. If any one can provide me solutions and references, I will really appreciate that.I was trying several days to get HTTPS connecti