Microsoft Azure Developer Associate AZ-204 Practice Question
You host a Windows-based ASP.NET Core web app in Azure App Service. Some requests occasionally return HTTP 500 errors that you cannot reproduce locally. You must collect verbose, per-request trace details-including events from IIS modules and handlers-and store them automatically in the LogFiles folder for later download. Which built-in diagnostics feature should you enable?
Failed request tracing (FREB) captures a complete trace for every request that matches the configured status code filter (such as 500 errors). The trace includes each IIS module and handler that processes the request and is written as XML files under the LogFiles\W3SVC* folder, with automatic log rotation. Detailed error messages only provide the error page shown to the client, not a full trace. Application logging (filesystem) records application-level log statements (for example, ILogger or System.Diagnostics) but not the IIS pipeline trace. HTTP logging writes standard access logs similar to IIS access logs and lacks module-level detail. Therefore, failed request tracing is the only option that meets the requirements.
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Microsoft Azure Developer Associate AZ-204
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