WebSocket连接失败(Java) Error during WebSocket handshake: Unexpected response code: 400

WebSocket握手时出现WebSocket连接失败(Java)错误:意外响应代码:400 WebSocket握手时出现WebSocket连接失败(Java)错误:意外响应代码:400简介:项目名称聊天端口号8080访问路径:“ws://localhost:8080/web socket quot；JDK: 1.8，Maven配置的tomcat是tomcat8，POM.xml补充