这是基于@特洛伊·亨特的更全面的回答。将这个函数添加到Global.asax.cs中的WebApplication类中:

    protected void Application_BeginRequest(Object sender, EventArgs e)
    {
        // Allow https pages in debugging
        if (Request.IsLocal)
        {
            if (Request.Url.Scheme == "http")
            {
                int localSslPort = 44362; // Your local IIS port for HTTPS

                var path = "https://" + Request.Url.Host + ":" + localSslPort + Request.Url.PathAndQuery;

                Response.Status = "301 Moved Permanently";
                Response.AddHeader("Location", path);
            }
        }
        else
        {
            switch (Request.Url.Scheme)
            {
                case "https":
                    Response.AddHeader("Strict-Transport-Security", "max-age=31536000");
                    break;
                case "http":
                    var path = "https://" + Request.Url.Host + Request.Url.PathAndQuery;
                    Response.Status = "301 Moved Permanently";
                    Response.AddHeader("Location", path);
                    break;
            }
        }
    }

(要在本地构建中启用SSL，请在项目的Properties dock中启用它)

这也取决于你的平衡器的品牌，对于web mux，你需要寻找http头x- webmux - ssl - terminate: true来计算传入的流量是ssl。详情:http://www.cainetworks.com/support/redirect2ssl.html

IIS7模块将允许您重定向。

    <rewrite>
        <rules>
            <rule name="Redirect HTTP to HTTPS" stopProcessing="true">
                <match url="(.*)"/>
                <conditions>
                    <add input="{HTTPS}" pattern="^OFF$"/>
                </conditions>
                <action type="Redirect" url="https://{HTTP_HOST}/{R:1}" redirectType="SeeOther"/>
            </rule>
        </rules>
    </rewrite>

对于那些使用ASP。净MVC。您可以使用以下两种方式在整个站点上强制使用HTTPS之上的SSL/TLS:

艰难的方式

1 -添加requirehttpattribute到全局过滤器:

GlobalFilters.Filters.Add(new RequireHttpsAttribute());

2 -强制防伪造令牌使用SSL/TLS:

AntiForgeryConfig.RequireSsl = true;

3 -通过更改Web，要求cookie默认要求HTTPS。配置文件:

<system.web>
    <httpCookies httpOnlyCookies="true" requireSSL="true" />
</system.web>

4 -使用NWebSec。拥有NuGet包并添加以下代码行以启用整个站点的严格传输安全。不要忘记在下面添加Preload指令，并将您的网站提交到HSTS Preload站点。更多信息在这里和这里。请注意，如果您不使用OWIN，也可以使用Web。config方法，你可以在NWebSec网站上阅读。

// app is your OWIN IAppBuilder app in Startup.cs
app.UseHsts(options => options.MaxAge(days: 30).Preload());

5 -使用NWebSec。拥有NuGet包并添加以下代码行，以启用跨站点的公钥固定(HPKP)。更多信息在这里和这里。

// app is your OWIN IAppBuilder app in Startup.cs
app.UseHpkp(options => options
    .Sha256Pins(
        "Base64 encoded SHA-256 hash of your first certificate e.g. cUPcTAZWKaASuYWhhneDttWpY3oBAkE3h2+soZS7sWs=",
        "Base64 encoded SHA-256 hash of your second backup certificate e.g. M8HztCzM3elUxkcjR2S5P4hhyBNf6lHkmjAHKhpGPWE=")
    .MaxAge(days: 30));

6 -包括https方案在任何URL的使用。当您在某些浏览器中限制该方案时，内容安全策略(CSP) HTTP报头和子资源完整性(SRI)不能很好地发挥作用。对于HTTPS最好是明确的。如。

<script src="https://ajax.aspnetcdn.com/ajax/bootstrap/3.3.4/bootstrap.min.js"></script>

简单的方法

使用ASP。NET MVC样板Visual Studio项目模板生成一个项目，所有这些和更多的内置。你也可以在GitHub上查看代码。

你需要做的是:

1)在web中添加一个键。配置，取决于生产或阶段服务器如下所示

<add key="HttpsServer" value="stage"/>
             or
<add key="HttpsServer" value="prod"/>

2)在Global内部。Asax文件添加如下方法。

void Application_BeginRequest(Object sender, EventArgs e)
{
    //if (ConfigurationManager.AppSettings["HttpsServer"].ToString() == "prod")
    if (ConfigurationManager.AppSettings["HttpsServer"].ToString() == "stage")
    {
        if (!HttpContext.Current.Request.IsSecureConnection)
        {
            if (!Request.Url.GetLeftPart(UriPartial.Authority).Contains("www"))
            {
                HttpContext.Current.Response.Redirect(
                    Request.Url.GetLeftPart(UriPartial.Authority).Replace("http://", "https://www."), true);
            }
            else
            {
                HttpContext.Current.Response.Redirect(
                    Request.Url.GetLeftPart(UriPartial.Authority).Replace("http://", "https://"), true);
            }
        }
    }
}

如果你不能在IIS中设置这个，我会做一个HTTP模块，为你重定向:

using System;
using System.Web;

namespace HttpsOnly
{
    /// <summary>
    /// Redirects the Request to HTTPS if it comes in on an insecure channel.
    /// </summary>
    public class HttpsOnlyModule : IHttpModule
    {
        public void Init(HttpApplication app)
        {
            // Note we cannot trust IsSecureConnection when 
            // in a webfarm, because usually only the load balancer 
            // will come in on a secure port the request will be then 
            // internally redirected to local machine on a specified port.

            // Move this to a config file, if your behind a farm, 
            // set this to the local port used internally.
            int specialPort = 443;

            if (!app.Context.Request.IsSecureConnection 
               || app.Context.Request.Url.Port != specialPort)
            {
               app.Context.Response.Redirect("https://" 
                  + app.Context.Request.ServerVariables["HTTP_HOST"] 
                  + app.Context.Request.RawUrl);    
            }
        }

        public void Dispose()
        {
            // Needed for IHttpModule
        }
    }
}

然后将其编译为DLL，将其作为项目的引用添加到web.config中:

 <httpModules>
      <add name="HttpsOnlyModule" type="HttpsOnly.HttpsOnlyModule, HttpsOnly" />
 </httpModules>