Asp.net MVC 301 www.domain.com重定向到domain.com [英] Asp.net mvc 301 redirect from www.domain.com to domain.com

问题描述

我们必须在domain.com一个网站，这也是通过一个CNAME条目www.domain.com指向回domain.com访问。我们希望所有访问者www.domain.com重定向使用301重定向到domain.com的。是什么在asp.net mvc的实现这一目标的最佳方式是什么？在Global.asax中？

We have a website at domain.com, which is also accessible via a CNAME entry for www.domain.com that points back to domain.com. We'd like all visitors to www.domain.com to be redirected to domain.com using a 301 redirect. What's the best way to implement this in asp.net mvc? In global.asax?

推荐答案

我承认在应用层面做的，这是不期望按照该意见的问题。

I accept that doing this at application level is non-desirable as per the comments to the question.

安装在HTTP重定向IIS7的特点是做到这一点的最好办法。

在我们的例子中，其他方面的限制迫使我们在应用层面做到这一点。

In our case, other constraints force us to do this at application level.

下面是我们在Global.asax的用于执行重定向的code：

Here is the code that we use in global.asax to perform the redirect:

    private static readonly Regex wwwRegex = 
        new Regex(@"www\.(?<mainDomain>.*)",
                  RegexOptions.Compiled
                      | RegexOptions.IgnoreCase 
                      | RegexOptions.Singleline);

    protected void Application_BeginRequest(Object sender, EventArgs e)
    {
        string hostName = Request.Headers["x-forwarded-host"];
        hostName = string.IsNullOrEmpty(hostName) ? Request.Url.Host : hostName;
        Match match = wwwRegex.Match(hostName);
        if (match.Success)
        {
            string mainDomain = match.Groups["mainDomain"].Value;
            var builder=new UriBuilder(Request.Url)
                            {
                                Host = mainDomain
                            };
            string redirectUrl = builder.Uri.ToString();
            Response.Clear();
            Response.StatusCode = 301;
            Response.StatusDescription = "Moved Permanently";
            Response.AddHeader("Location", redirectUrl);
            Response.End();
        }
    }

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