Built-in URL Rewriting for .NET

ASP.NET 3.5 SP1 is going to have built in support for URL Rewriting ... finally.

from: http://weblogs.asp.net/scottgu/arch...nd-net-framework-3-5-service-pack-1-beta.aspx

 

It's actually pretty easy to add your own URL rewrite to the global.asax file, I use it here http://forum.itcn.com

 

when is it coming out? i can't wait...

 

It's already out.

http://weblogs.asp.net/scottgu/arch...nd-net-framework-3-5-service-pack-1-beta.aspx

 

Awesome, about time...

 

About time is right. insane that it took this long.

Only prob is that not many hosting companies will have the newest version running.

 

As I said, I've been doing URL rewriting with .NET for years using the global.asax file. The following .NET 2.0 code will change pagenames from this:
/pagename.aspx?id=101
to this:
/mypage/101/whatever-file-name-you-want.aspx

Sub Application_BeginRequest(ByVal sender as Object, ByVal e as EventArgs)

	Try
	
		Dim httpContext As System.Web.HttpContext = httpContext.Current()
		Dim currentURL As String = Request.ServerVariables("PATH_INFO")
		Dim finalURL As String
	
		finalURL = rewriteUrl(currentURL)
	
		httpContext.RewritePath(finalURL)
	
	
	Catch ex As Exception
		Response.Write("Error in Global.asax :" & ex.Message + Constants.vbLf + Constants.vbLf + ex.StackTrace.ToString() & Constants.vbLf + Constants.vbLf)
	
	End Try

End Sub

Public Function rewriteUrl(byVal thisURL As String)

	Dim currentFileName As String
	Dim currentFileType As String
	Dim currentFileID As String
	Dim returnURL As String

	Dim rewrite_regex As Regex = New Regex("^.*/(?<fileType>[^/]+)/(?<identifier>\d+)/(?<fileName>[^/]+)(\?.*)?", RegexOptions.IgnoreCase)
	
	Dim match_rewrite As Match = rewrite_regex.Match(thisURL)
	
	currentFileID = match_rewrite.Groups("identifier").Value
	currentFileName = match_rewrite.Groups("fileName").Value.toString()
	currentFileType = match_rewrite.Groups("fileType").Value.toString()

	If currentFileID <> "" Then
		If currentFileType = "mypage" Then
			returnURL = "/pagename.aspx?id=" & currentFileID
		Else
			'### NO MATCH, JUST PASS TO REQUESTED URL 
			returnURL = thisURL
		End If
	Else
		returnURL = thisURL
		
	End If
	

	Return returnURL

End Function

Code (markup):

 

itcn thanks for the help and nice code. Excellent for dealing with individual pages.

What I mainly want is redirecting at the domain level. I think this is not possible in 2.0 and needs to be done in IIS.

for example
user types in, or clicks link: http://www.sitename.com
and gets permanently 301'd to : http://sitename.com

the whole 'google cannonicalization' issue so google will be forced to see only one site.

I hate dealng with bloody hosting companies it would nice to be able to do this on my own without involving them.

 

Ah yes, for 301s -- but it still works the same way. I still use the PATH_INFO redirect method, and create 2 sites. Then just put the redirect code in the global.asax file of the site you want to redirect to the other one. The regex is a bit different, though.

 

You can getaway with doing something like

string serverInfo = Request.ServerVariables["SERVER_NAME"].ToString();
        string cUrl = Request.FilePath;

        //forward all traffic to the www. domain unless we are testing internally
        if (!serverInfo.Contains("www.domain.com") && !serverInfo.Contains("192.168"))
        {
            Response.Status = "301 Moved Permanently";
            Response.AddHeader("Location", "http://www.yourdomain.com" + cUrl);
            Response.End();
        }

Code (markup):

This will 301 any request not to www.domain.com. I use this on the masterpage of some of my smaller sites.

 

also, you made need to handle query strings as well

string cParams = Request.QueryString.ToString();

if (cParams != "")
 cParams = "?" + cParams;

Code (markup):

and you can append that to your redirect

 

How to do the same in 2.0

 

Can it be done in 2.0?

 

Read my post above, I provide the code to put in your global.asax file for URL rewrites in .NET 2.0

 

I use an ISAPI rewrite engine. I have used it with last two versions of IIS with great success. Check out Helicon.