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在这个案例里，展示排查HTTP 401问题的技巧。
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访问： https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/admin
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结果是：
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```
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Something went wrong: 401 Unauthorized
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```
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我们知道`401`通常是被权限管理的`Filter`拦截了，那么到底是哪个`Filter`处理了这个请求，返回了401？
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### 跟踪所有的Filter函数
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开始trace：
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`trace javax.servlet.Filter *`{{execute T2}}
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访问： https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/admin
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可以在调用树的最深层，找到`AdminFilterConfig$AdminFilter`返回了`401`：
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```
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+---[3.806273ms] javax.servlet.FilterChain:doFilter()
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| `---[3.447472ms] com.example.demo.arthas.AdminFilterConfig$AdminFilter:doFilter()
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| `---[0.17259ms] javax.servlet.http.HttpServletResponse:sendError()
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```
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### 通过stack获取调用栈
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上面是通过`trace`命令来获取信息，从结果里，我们可以知道通过`stack`跟踪`HttpServletResponse:sendError()`，同样可以知道是哪个`Filter`返回了`401`
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执行：
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`stack javax.servlet.http.HttpServletResponse sendError 'params[0]==401'`{{execute T2}}
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访问： https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/admin
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```bash
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$ stack javax.servlet.http.HttpServletResponse sendError 'params[0]==401'
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Press Q or Ctrl+C to abort.
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Affect(class-cnt:2 , method-cnt:4) cost in 87 ms.
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ts=2019-02-15 16:44:06;thread_name=http-nio-8080-exec-6;id=16;is_daemon=true;priority=5;TCCL=org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedWebappClassLoader@8546cd5
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@org.apache.catalina.connector.ResponseFacade.sendError()
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at com.example.demo.arthas.AdminFilterConfig$AdminFilter.doFilter(AdminFilterConfig.java:38)
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at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
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at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
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at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
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at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
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```
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