Asp.net mvc 301 从 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

我们在 domain.com 上有一个网站，也可以通过指向 domain.com 的 www.domain.com 的 CNAME 条目访问该网站.我们希望使用 301 重定向将 www.domain.com 的所有访问者重定向到 domain.com.在 asp.net mvc 中实现它的最佳方法是什么?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

根据问题的评论，我接受在应用程序级别执行此操作是不可取的.

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

在 IIS7 中安装 HTTP 重定向功能是最好的方法.

在我们的例子中，其他约束迫使我们在应用程序级别执行此操作.

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

这是我们在 global.asax 中用来执行重定向的代码:

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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