如何使用Angular 2在POST上的ASP.NET MVC 4中启用跨源请求 [英] How to enable cross origin requests in ASP.NET MVC 4 on POST using Angular 2

问题描述

我正在尝试使用CORS发出POST请求.

I'm trying to make a POST request with CORS.

我有一个类，可以在控制器内部的方法上添加正确的响应标头

I've a class that adds the correct response header on my methods inside my controller

using System;
using System.Web.Mvc;

public class AllowCrossSiteAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        filterContext.RequestContext.HttpContext.Response.AddHeader("Access-Control-Allow-Origin", "http://localhost:4200");
        filterContext.RequestContext.HttpContext.Response.AddHeader("Access-Control-Allow-Headers", "*");
        filterContext.RequestContext.HttpContext.Response.AddHeader("Access-Control-Allow-Credentials", "true");

        base.OnActionExecuting(filterContext);
    }
}

我这样使用

[AllowCrossSite]
public ActionResult GetReportParameters(string IdRapport)

，我得到了预期的结果

and I get the expected result

但是问题是，当我尝试通过自定义标头发出POST请求以传递此特定内容类型

'Content-Type': 'application/json; charset=utf-8'

我实际上正在获得这些Response标头

I'm actually getting these Response headers

因此，即使我正确进入了属性类，也好像没有对标题进行任何操作.

So it's like nothing is done about the header even if I'm correctly going in my attribute class.

这是我在Angular 2服务中的一面

const headers = new Headers({ 'Content-Type': 'application/json; charset=utf-8' });
const options = new RequestOptions({ headers: headers , withCredentials: true });

const mock = {
  name: 'TitreRegroupement1',
  visible: false,
  type: 'System.String',
  value: 'Test'
};

// tslint:disable-next-line:max-line-length
const body = JSON.stringify({ idRapport: '00392024-d171-4f39-9c5c-97a51f53fd54', filtre: '', exportFormat: '', parameters: data });

return this.http.post('http://localhost:8080/ReportingViewer/ExportReport', body, options)
  .map((response: Response) => {
      return this.extractSingleData(response, Parameters);
  })
  .catch(this.handleError);
}

通过使用postman可以毫无问题地进行声明，整个过程都可以正常进行，我可以从控制器内部的方法访问我的参数而没有问题.

By using postman there is no problem to declare, the whole thing travel correctly I can access my parameters from the method inside the controller with no problem.

推荐答案

我找到了使其工作的方法.首先，我应用我的建议 sideshowbarker

I found how to make it work. First I apply what proposed me sideshowbarker

if (Request.Headers.AllKeys.Contains("Origin", StringComparer.OridinalIgnoreCase) &&
    Request.HttpMethod == "OPTIONS") {
    Response.Flush();
}

我在标头中丢失了一些内容，我一直都在做"*"，但最终这些参数都起作用了

and I was missing something in my Headers, I was doing "*" all the way but finally with these parameters it worked

filterContext.RequestContext.HttpContext.Response.AddHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");

对于那些对我课程的最终形式感兴趣的人是

for those who are interested in the final form of my class here it is

using System;
using System.Web;
using System.Web.Mvc;

namespace Via.Client.WebMvc
{
    public class AllowCrossSiteAttribute : System.Web.Mvc.ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {    
            filterContext.RequestContext.HttpContext.Response.AddHeader("Access-Control-Allow-Origin", "http://localhost:4200");
            filterContext.RequestContext.HttpContext.Response.AddHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
            filterContext.RequestContext.HttpContext.Response.AddHeader("Access-Control-Allow-Credentials", "true");

            if (filterContext.HttpContext.Request.HttpMethod == "OPTIONS")
            {
                filterContext.HttpContext.Response.Flush();
            }

            base.OnActionExecuting(filterContext);
        }
    }
}

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