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As most of you would know, if I drop a file named app_offline.htm in the root of an asp.net application, it takes the application offline as detailed here.
You would also know, that while this is great, IIS actually returns a 404 code when this is in process and Microsoft is not going to do anything about it as mentioned here.
Now, since Asp.Net in general is so extensible, I am thinking that shouldn't there be a way to over ride this status code to return a 503 instead? The problem is, I don't know where to start looking to make this change.
HELP!
926
The handling of app_offline.htm is hardcoded in the ASP.NET pipeline, and can't be modified: see CheckApplicationEnabled() in HttpRuntime.cs, where it throws a very non-configurable 404 error if the application is deemed to be offline.
However, creating your own HTTP module to do something similar is of course trivial -- the OnBeginRequest handler could look as follows in this case (implementation for a HttpHandler shown, but in a HttpModule the idea is exactly the same):
Public Sub ProcessRequest(ByVal ctx As System.Web.HttpContext) Implements IHttpHandler.ProcessRequest
If IO.File.Exists(ctx.Server.MapPath("/app_unavailable.htm")) Then
ctx.Response.Status = "503 Unavailable (in Maintenance Mode)"
ctx.Response.Write(String.Format("<html><h1>{0}</h1></html>", ctx.Response.Status))
ctx.Response.End()
End If
End Sub
This is just a starting point, of course: by making the returned HTML a bit friendlier, you can display a nice "we'll be right back" page to your users as well.
190
You can try turning it off in the web.config.
<httpRuntime enable = "False"/>
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