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IIS7 Overrides customErrors when setting Response.StatusCode?

Asked 2009-01-12T02:37:56.913
100

Having a weird problem here. Everybody knows that if you use web.config's customErrors section to make a custom error page, that you should set your Response.StatusCode to whatever is appropriate. For example, if I make a custom 404 page and name it 404.aspx, I could put <% Response.StatusCode = 404 %> in the contents in order to make it have a true 404 status header.

Follow me so far? Good. Now try to do this on IIS7. I cannot get it to work, period. If Response.StatusCode is set in the custom error page, IIS7 seems to override the custom error page completely, and shows its own status page (if you have one configured.)

Has anyone else seen this behavior and also maybe know how to work around it? It was working under IIS6, so I don't know why things changed.

Note: This is not the same as the issue in ASP.NET Custom 404 Returning 200 OK Instead of 404 Not Found

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2 Answers

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I'm not sure if this is similar in nature or not, but I solved an issue that sounds similar on the surface and here's how I handled it.

First of all, the default value for existingResponse (Auto) was the correct answer in my case, since I have a custom 404, 400 and 500 (I could create others, but these three will suffice for what I'm doing). Here are the relevant sections that helped me.

From web.config:

<customErrors mode="Off" />

And

<httpErrors errorMode="Custom" existingResponse="Auto" defaultResponseMode="ExecuteURL">
  <clear />
  <error statusCode="404" path="/errors/404.aspx" responseMode="ExecuteURL" />
  <error statusCode="500" path="/errors/500.aspx" responseMode="ExecuteURL" />
  <error statusCode="400" path="/errors/400.aspx" responseMode="ExecuteURL" />
</httpErrors>

From there, I added this into Application_Error on global.asax:

    Response.TrySkipIisCustomErrors = True

On each of my custom error pages I had to include the correct response status code. In my case, I'm using a custom 404 to send users to different sections of my site, so I don't want a 404 status code returned unless it actually is a dead page.

Anyway, that's how I did it. Hope that helps someone.

answered 2013-07-31T12:44:48.700
0

By default IIS 7 uses detailed custom error messages so I would assume that Response.StatusCode will equal 404.XX rather than just 404.

You can configure IIS7 to use the simpler error message codes or modify your code handling the more detailed error messages that IIS7 offers.

More info available here: http://blogs.iis.net/rakkimk/archive/2008/10/03/iis7-enabling-custom-error-pages.aspx

Further investigation revealed I had it the wrong way around - detailed messages aren't by default but perhaps they've been turned on, on your box if you're seeing the different error messages that you've mentioned.

answered 2009-01-12T02:53:21.967

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