CODEWITHSUNDEEP
asp.netmodulehandlerhttp-status-code-404
maxp
maxp

Reputation: 25151

Catching / Redirecting 404's (ASP.NET)

Ive noticed that when I request a page in ASP.NET (webforms) that does not exist, the 'StaticFile' handler deals with the error notification.

Id like to be a bit more helpful in these situations.

What is the correct way for me to intercept this 404, and as a result, run some code to redirect the user?

Two ways Ive thought of doing which I currently don't really like are:

1 - Create a module that basically does a if (!file.exists($url){redirect to $correctedurl})

2 - Modify the error.aspx.cs(or the default error page) to do something similar (yuck!)

Upvotes: 0

Views: 971

Answers (4)

Pauli Østerø
Pauli Østerø

Reputation: 6916

Create a HttpModule that responds to the Error-event of your application. In here you can get access the Exception and StatusCode of the Response and if the Code is 404 (NotFound) you can respons accordingly to it. Usually rewriting the request, setting StatusCode to Found and clearing the Exception. That way customErrors in web.config wont be hit and the process will be $RequestedUrl -> $CorrectedURL.

This is an example of creating a HttpModule that responds to error events in asp.net.

http://www.codeproject.com/KB/aspnet/GlobalErrorHandler.aspx

Upvotes: 0

Chase Florell
Chase Florell

Reputation: 47387

Just rock the CustomErrors in the web.Config

<configuration>
  <system.web>
    <customErrors defaultRedirect="Error.htm"
                  mode="RemoteOnly">
      <error statusCode="404"
             redirect="~/NotFound.aspx"/>
    </customErrors>
  </system.web>
</configuration>

Upvotes: 0

Richard Friend
Richard Friend

Reputation: 16018

There are two areas that you have to modify in order to capture 404s. The first is in IIS itself, which will take care of any non-aspx files such as css, jpg, js, etc. The second is in the web.config of the app itself which will handle missing aspx's.

The link below shows how to accomplish this.

see here

Upvotes: 1

Joe
Joe

Reputation: 57179

The web config has a customErrors section that lets you specify where to direct specific error codes.

If you would like to intercept the request when it is first made you will need a Global.asax and respond to the BeginRequest event. At that point you can determine if a file exist on the server and Response.Redirect on the context. Just make sure you understand every request goes through that event including JS files, CSS and images. HttpApplication Documentation

Upvotes: 1

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