How do I debug .net IIS custom HTTP errors locally

Asked Aug 20 '18 at 15:42

Active Aug 20 '18 at 15:42

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I want to debug the controller that handles all HTTP errors in the site. There is the following in the web.config

<httpErrors errorMode="Custom" existingResponse="Replace">
  <remove statusCode="404" />
  <error statusCode="404" responseMode="ExecuteURL" path="/Error/NotFound" />
  <remove statusCode="500" />
  <error statusCode="500" responseMode="ExecuteURL" path="/Error/ServerError" />
</httpErrors>

But when I deliberately throw an exception

throw new HttpException(500, "error, I cant be bothered");

The controller for Error/ServerError is not hit and I get the standard yellow detailed error page.

The documentation states

If you set the errorMode value to Custom, IIS returns only custom error messages to all requesting browsers.

https://learn.microsoft.com/en-us/iis/configuration/system.webserver/httperrors/

Which should mean local errors are handled by the custom pages.

What other settings affect the display of detailed error message? What can I change to get the custom error page to display locally?

Thanks

asked Aug 20 '18 at 15:42

moefinley

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The issue may be thorny, depending on which version of IIS or VS Dev server you're using, whether it's asp.net or IIS native, etc.. This link may help https://stackoverflow.com/questions/2480006/what-is-the-difference-between-customerrors-and-httperrors – Erik Funkenbusch Aug 20 '18 at 15:52
I'm using IIS 7.5 – moefinley Aug 20 '18 at 15:54
You could try the customErrors element instead – Erik Funkenbusch Aug 20 '18 at 16:08

How do I debug .net IIS custom HTTP errors locally

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