java.lang.IllegalArgumentException: Invalid character found in method name. HTTP method names must be tokens

    at org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:416) ~[tomcat-embed-core-9.0.31.jar:9.0.31]

    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:260) ~[tomcat-embed-core-9.0.31.jar:9.0.31]

    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.31.jar:9.0.31]

    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.31.jar:9.0.31]

    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1639) [tomcat-embed-core-9.0.31.jar:9.0.31]

    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.31.jar:9.0.31]

    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_144]

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_144]

    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.31.jar:9.0.31]

    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_144]

查看网络显示错误信息：Failed to load resource: net::ERR_SSL_PROTOCOL_ERROR。

前端请求后端的路径的协议写错了，将路径的https修改为http即可。