404 Error while using ASP.NET URL Routing

I’m heavily using the new ASP.NET URL Routing feature introduced in .NET Framework 3.5 SP1 in my new ASP.NET Applications instead of traditional URL Rewriting. I actually wanted to use IIS7 URL Rewriting, but there’s no way to test your rewrite rules if you are using the built-in VS2008 Cassini Webserver for development (yet).

So I’ve set up some sweet URL Routing rules with Webforms and I have to say it works pretty good so far. However, sooner or later I stumbled upon the first problem. I used an UpdatePanel on a webform which went through the URL Routing mechanism. As soon as I hit the postback button I got the following error:

Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the quest on the server. The status code returned from the server was: 404.

Obviously because the form action attribute didn’t supply the full URL and that is the problem. You can fix it by adding this to your Page_Load:

form1.Action = HttpContext.Current.Request.RawUrl;

I just added it into the MasterPage Page_Load as I’m using URL Routing all over the Page. That’ll fix it.

I’ve also seen this:

if (!String.IsNullOrEmpty(Request.ServerVariables["HTTP_X_ORIGINAL_URL"]))
          form1.Action = Request.ServerVariables["HTTP_X_ORIGINAL_URL"];

However, that snippet doesn’t work for me, I actually don’t know why. If that’s the case for you, too, just use the RawURL snippet above (without an if block).

1 comment so far ↓

#1 Deepak Talwar on 07.11.12 at 2:02 am

Thanks. It works for me

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