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57 lines
2.1 KiB
Markdown
57 lines
2.1 KiB
Markdown
5 years ago
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In this case, the user will resolve the HTTP 401 issue.
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Visit: https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/admin
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The result is:
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```
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Something went wrong: 401 Unauthorized
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```
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We know that `401` is usually intercepted by the permission-managed `Filter`, so which `Filter` returns 401?
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### Track all Filter methods
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Start trace:
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`trace javax.servlet.Filter *`{{execute T2}}
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Visit: https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/admin
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At the deepest level of the call tree, you can find `AdminFilterConfig$AdminFilter` which returns `401`:
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```
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+---[3.806273ms] javax.servlet.FilterChain:doFilter()
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| `---[3.447472ms] com.example.demo.arthas.AdminFilterConfig$AdminFilter:doFilter()
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| `---[0.17259ms] javax.servlet.http.HttpServletResponse:sendError()
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```
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### Get the call stack through stack command
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From the above result, we can find the method: `HttpServletResponse:sendError()`. So we can use `stack` command to resolved the HTTP `401` issue.
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Run:
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`stack javax.servlet.http.HttpServletResponse sendError 'params[0]==401'`{{execute T2}}
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Visit: https://[[HOST_SUBDOMAIN]]-80-[[KATACODA_HOST]].environments.katacoda.com/admin
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The Result:
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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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