java.io.IOException: Server returned HTTP response code: 400 for URL

關於java.io.IOException: Server returned HTTP response code: 400 for URL報錯和string.getBytes()字符集 - 隨筆記 - 博客園
https://www.cnblogs.com/sunshineweb/p/7772222.html

URL編碼問題java.io.IOException: Server returned HTTP response code: 400 for URL: http://_java_houjx3的博客-CSDN博客
https://blog.csdn.net/houjx3/article/details/84064985

java-Server returned HTTP response code: 400 for URL——CSDN問答頻道
https://ask.csdn.net/questions/699824