如何在Asp.Net-MVC中添加自定义HTTP标头 [英] How to add custom HTTP Headers in Asp.Net-MVC

问题描述

我创建了一个自定义处理程序，如下所示:

I created a custom handler that looks like follow:

public class SitHandler : DelegatingHandler
{
    protected override async Task<HttpResponseMessage> SendAsync(
        HttpRequestMessage request, CancellationToken cancellationToken)
    {
        Debug.WriteLine("Process request");
        // Call the inner handler.
        var response = await base.SendAsync(request, cancellationToken);
        Debug.WriteLine("Process response");
        return response;
    }
}

并在WebApiConfig类中注册:

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
      // Web API configuration and services

      //Delegating Handlers
      config.MessageHandlers.Add(new SitHandler());

      // Web API routes
      config.MapHttpAttributeRoutes();

      /*config.Routes.MapHttpRoute(
          name: "DefaultApi",
          routeTemplate: "api/{controller}/{id}",
          defaults: new { id = RouteParameter.Optional }
      );*/
    }
}

并具有以下路线:

[RoutePrefix("")]
public class SignInController : Controller
{
    [Route("", Name = "Default")]
    public ActionResult Index()
    {
      return View();
    }
}

现在，当我启动服务器时，它将按预期显示正确的页面:

Now when I start the server it show me the correct page as expected:

但是请求没有通过处理程序，为什么?
什么是内部处理程序?

But the request does not goi throught the handler, why?
And what is an innerhandler?

// Call the inner handler.
var response = await base.SendAsync(request, cancellationToken);

推荐答案

对于MVC，您需要添加ActionFilterAttribute

For MVC you will need to add an ActionFilterAttribute

[AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, AllowMultiple = false, Inherited = true)]
public class MyCustomFilter : System.Web.Mvc.ActionFilterAttribute {
    public override void OnActionExecuted(ActionExecutedContext context) {
        Debug.WriteLine("Process response");
        //From here you have access to the response to process what you need
        //eg: context.HttpContext.Response.Headers.Add("MyCustomHeaderName","value");

        base.OnActionExecuted(context);
    }
}

然后您可以在操作上使用您的属性...

you can then either use you attribute on an action...

[MyCustomFilter]
[Route("", Name = "Default")]
public ActionResult Index(){...}

，课...

[MyCustomFilter]
[RoutePrefix("")]
public class SignInController : Controller {...}

或全局设置...

public class FilterConfig {
    public static void RegisterGlobalFilters(GlobalFilterCollection filters) {
        filters.Add(new MyCustomFilter());
    }
}

这篇关于如何在Asp.Net-MVC中添加自定义HTTP标头的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！