java.io.IOException: Server returned HTTP response code: 400 for URL
关于java.io.IOException: Server returned HTTP response code: 400 for URL报错和string.getBytes()字符集 - 随笔记 - 博客园
https://www.cnblogs.com/sunshineweb/p/7772222.html
URL编码问题java.io.IOException: Server returned HTTP response code: 400 for URL: http://_java_houjx3的博客-****博客
https://blog.****.net/houjx3/article/details/84064985
java-Server returned HTTP response code: 400 for URL——****问答频道
https://ask.****.net/questions/699824