缺少 Accept 请求头，添加就好了.

    • curl 会自动添加请求头 accept: /
    • 自己写可能会遗落这一点。
      1. [2021-08-09 19:26:11.360] - [程序发生通用异常][Could not find acceptable representation]
      2. org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation
      3.       at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:251)
      4.       at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:181)
      5.       at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:82)
      6.       at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:124)
      7.       at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:888)
      8.       at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)
      9.       at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
      10.       at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
      11.       at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
      12.       at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
      13.       at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
      14.       at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
      15.       at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
      16.       at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
      17.       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)