请使用HSTS (HTTP严格传输安全)

从http://www.hanselman.com/blog/HowToEnableHTTPStrictTransportSecurityHSTSInIIS7.aspx

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
            <rules>
                <rule name="HTTP to HTTPS redirect" stopProcessing="true">
                    <match url="(.*)" />
                    <conditions>
                        <add input="{HTTPS}" pattern="off" ignoreCase="true" />
                    </conditions>
                    <action type="Redirect" url="https://{HTTP_HOST}/{R:1}"
                        redirectType="Permanent" />
                </rule>
            </rules>
            <outboundRules>
                <rule name="Add Strict-Transport-Security when HTTPS" enabled="true">
                    <match serverVariable="RESPONSE_Strict_Transport_Security"
                        pattern=".*" />
                    <conditions>
                        <add input="{HTTPS}" pattern="on" ignoreCase="true" />
                    </conditions>
                    <action type="Rewrite" value="max-age=31536000" />
                </rule>
            </outboundRules>
        </rewrite>
    </system.webServer>
</configuration>

原答案(2015年12月4日取代)

基本上

protected void Application_BeginRequest(Object sender, EventArgs e)
{
   if (HttpContext.Current.Request.IsSecureConnection.Equals(false) && HttpContext.Current.Request.IsLocal.Equals(false))
   {
    Response.Redirect("https://" + Request.ServerVariables["HTTP_HOST"]
+   HttpContext.Current.Request.RawUrl);
   }
}

它会被放到global。asax。cs(或global。asax。vb)

我不知道如何在web.config中指定它

如果您正在使用ASP。你可以试试这个包:赛达。aspnetcore . httpwithstricttransport security。

然后你只需要加

app.UseHttpsWithHsts(HttpsMode.AllowedRedirectForGet, configureRoutes: routeAction);

这也会将HTTP StrictTransportSecurity头添加到所有使用https方案的请求中。

示例代码和文档https://github.com/saidout/saidout-aspnetcore-httpswithstricttransportsecurity#example-code

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>

对于上面的@Joe，“这是给我一个重定向循环。在我添加代码之前，它工作得很好。有什么建议吗?——乔11月8日11月4点13分

这种情况也发生在我身上，我认为发生的情况是有一个负载均衡器在Web服务器前终止SSL请求。因此，我的Web站点总是认为请求是“http”，即使原始浏览器要求它是“https”。

I admit this is a bit hacky, but what worked for me was to implement a "JustRedirected" property that I could leverage to figure out the person was already redirected once. So, I test for specific conditions that warrant the redirect and, if they are met, I set this property (value stored in session) prior to the redirection. Even if the http/https conditions for redirection are met the second time, I bypass the redirection logic and reset the "JustRedirected" session value to false. You'll need your own conditional test logic, but here's a simple implementation of the property:

    public bool JustRedirected
    {
        get
        {
            if (Session[RosadaConst.JUSTREDIRECTED] == null)
                return false;

            return (bool)Session[RosadaConst.JUSTREDIRECTED];
        }
        set
        {
            Session[RosadaConst.JUSTREDIRECTED] = value;
        }
    }

如果SSL支持在您的站点中不可配置(例如。应该能够打开/关闭https) -你可以在任何你希望保护的控制器/控制器动作上使用[RequireHttps]属性。

您还可以通过向浏览器返回“Strict-Transport-Security”报头来使用HSTS。浏览器必须支持这一点(目前主要是Chrome和Firefox支持)，但这意味着一旦设置好，浏览器将不会通过HTTP向站点发出请求，而是在发出请求之前将它们转换为HTTPS请求。尝试结合从HTTP重定向:

protected void Application_BeginRequest(Object sender, EventArgs e)
{
  switch (Request.Url.Scheme)
  {
    case "https":
      Response.AddHeader("Strict-Transport-Security", "max-age=300");
      break;
    case "http":
      var path = "https://" + Request.Url.Host + Request.Url.PathAndQuery;
      Response.Status = "301 Moved Permanently";
      Response.AddHeader("Location", path);
      break;
  }
}

不了解HSTS的浏览器将忽略头文件，但仍然会被switch语句捕获并发送到HTTPS。