Pearls of MOSSy Wisdom

http://www.sharepointblogs.com/tmt/archive/2008/01/21/sharepoint-2007-redirect-solved-using-301-instead-of-302-redirects.aspx

<add name="CustomRedirectModule" type="Custom.Sharepoint.RedirectFix.RedirectModule" />

 

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Text.RegularExpressions;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Publishing;

namespace Custom.Sharepoint.RedirectFix
{
    public class RedirectModule : IHttpModule 
    {
        #region IHttpModule Members   
        public void Dispose() { }   
       
        public void Init(HttpApplication context)   
        {     
            context.BeginRequest += new EventHandler(context_BeginRequest);   
        }

        void context_BeginRequest(object sender, EventArgs e)   
        {     
            HttpApplication app = (HttpApplication)sender;

            string userAgent = app.Request.UserAgent.ToLowerInvariant();
            if (userAgent.Contains("infopath") || userAgent.Contains("frontpage"))
                return;
            string requestUrl = app.Request.Url.ToString();
            Regex regEx = new Regex(@"^https?://.*(?<itemUrl>/[^/]+\.[^/\.]+)$");
            if (regEx.IsMatch(requestUrl))
                return;     
            if (!requestUrl.EndsWith("/", StringComparison.CurrentCulture))
                requestUrl += "/";     
            string destinationUrl = String.Empty;
            SPSecurity.RunWithElevatedPrivileges(delegate()
            {
                try
                {
                    using (SPSite site = new SPSite(requestUrl))
                    {
                        using (SPWeb web = site.OpenWeb())
                        {
                            if (PublishingWeb.IsPublishingWeb(web))
                            {
                                PublishingWeb publishingWeb = PublishingWeb.GetPublishingWeb(web);
                                destinationUrl = String.Concat(requestUrl, publishingWeb.DefaultPage.Url);
                            }
                            else
                            {
                                destinationUrl = String.Concat(requestUrl, "index.aspx");
                                destinationUrl = String.Concat(requestUrl, web.RootFolder.WelcomePage.ToString().Substring(web.RootFolder.WelcomePage.ToString().LastIndexOf('.') + 1));
                            }
                        }
                    }
                }
                catch { }
            });
            if (!String.IsNullOrEmpty(destinationUrl))
            {
                app.Response.AddHeader("Location", destinationUrl);
                app.Response.StatusCode = 301;
            }   
        }   
        #endregion 

    }//class
}//namespace

protected override void OnLoad(EventArgs e)
{
  base.OnLoad(e);
  string targetUrl = this.GetRedirectTargetUrl();
  if (!string.IsNullOrEmpty(targetUrl))
  {
     SPUtility.Redirect(targetUrl, SPRedirectFlags.Default, Context);
 }
}

Context.Response.Status = "301 Moved Permanently";
Context.Response.AddHeader("Location",targetUrl);

protected override void OnLoad(EventArgs e)
{
 base.OnLoad(e);
 string targetUrl = this.GetRedirectTargetUrl();
 if (!string.IsNullOrEmpty(targetUrl))
 {
//SPUtility.Redirect(targetUrl, SPRedirectFlags.Default, Context);
Context.Response.Status = "301 Moved Permanently";
                Context.Response.AddHeader("Location",targetUrl);
 }
}