一个 mvc web 项目后端如何访问另一个 mvc api 项目

Question

有两个 asp.net mvc 项目。一个是 mvc api，另一个是 mvc web。 使用owin 进行auth2 的mvc api。和 mvc web 访问支持的 api，而不是 js。 问题是，当 web (backed) 访问 api 时，将没有响应，但如果我使用桌面 win 表单客户端，它可以工作。 我想知道为什么，以及如何解决它。

一些代码和包，vs2015

拥有客户端

private HttpClient _client;
....
    private async Task<TokenParam> GetAccessToken(string user,string psw)
    {
        var parameters = new Dictionary<string,string>();
        parameters.Add("grant_type","password");
        parameters.Add("username",user);
        parameters.Add("password",psw);

        _client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(Encoding.ASCII.GetBytes(Id + ":" + Secret)));

        var response = await _client.PostAsync("/token",new FormUrlEncodedContent(parameters));
        var value = await response.Content.ReadAsStringAsync();-----> here no response back from api server

        if (response.StatusCode == HttpStatusCode.OK)
        {
            var o = value.FromJson<TokenParam>();
            o.LoginTime = DateTime.Now.AddSeconds(-10);
            return o;
        }
        return null;
    }

自己的服务器端

public override async Task GrantResourceOwnerCredentials(OAuthGrantResourceOwnerCredentialsContext context)
    {
        var oAuthIdentity = new ClaimsIdentity(context.Options.AuthenticationType);
        oAuthIdentity.AddClaim(new Claim(ClaimTypes.Name,context.UserName));
        var ticket = new AuthenticationTicket(oAuthIdentity,new AuthenticationProperties());
        context.Validated(ticket);
        await base.GrantResourceOwnerCredentials(context);
    }

我的 packages.config 文件

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="Antlr" version="3.4.1.9004" targetFramework="net452" />
  <package id="bootstrap" version="3.0.0" targetFramework="net452" />
  <package id="EntityFramework" version="6.1.3" targetFramework="net452" />
  <package id="jQuery" version="1.10.2" targetFramework="net452" />
  <package id="jQuery.Validation" version="1.11.1" targetFramework="net452" />
  <package id="Microsoft.AspNet.Identity.Core" version="2.2.1" targetFramework="net452" />
  <package id="Microsoft.AspNet.Identity.EntityFramework" version="2.2.1" targetFramework="net452" />
  <package id="Microsoft.AspNet.Identity.Owin" version="2.2.1" targetFramework="net452" />
  <package id="Microsoft.AspNet.Mvc" version="5.2.3" targetFramework="net452" />
  <package id="Microsoft.AspNet.Razor" version="3.2.3" targetFramework="net452" />
  <package id="Microsoft.AspNet.Web.Optimization" version="1.1.3" targetFramework="net452" />
  <package id="Microsoft.AspNet.WebApi" version="5.2.3" targetFramework="net452" />
  <package id="Microsoft.AspNet.WebApi.Client" version="5.2.3" targetFramework="net452" />
  <package id="Microsoft.AspNet.WebApi.Core" version="5.2.3" targetFramework="net452" />
  <package id="Microsoft.AspNet.WebApi.HelpPage" version="5.2.3" targetFramework="net452" />
  <package id="Microsoft.AspNet.WebApi.Owin" version="5.2.3" targetFramework="net452" />
  <package id="Microsoft.AspNet.WebApi.WebHost" version="5.2.3" targetFramework="net452" />
  <package id="Microsoft.AspNet.WebPages" version="3.2.3" targetFramework="net452" />
  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="1.0.0" targetFramework="net452" />
  <package id="Microsoft.jQuery.Unobtrusive.Validation" version="3.2.3" targetFramework="net452" />
  <package id="Microsoft.Net.Compilers" version="1.0.0" targetFramework="net452" developmentDependency="true" />
  <package id="Microsoft.Owin" version="3.0.1" targetFramework="net452" />
  <package id="Microsoft.Owin.Host.SystemWeb" version="3.0.1" targetFramework="net452" />
  <package id="Microsoft.Owin.Security" version="3.0.1" targetFramework="net452" />
  <package id="Microsoft.Owin.Security.Cookies" version="3.0.1" targetFramework="net452" />
  <package id="Microsoft.Owin.Security.Facebook" version="3.0.1" targetFramework="net452" />
  <package id="Microsoft.Owin.Security.Google" version="3.0.1" targetFramework="net452" />
  <package id="Microsoft.Owin.Security.MicrosoftAccount" version="3.0.1" targetFramework="net452" />
  <package id="Microsoft.Owin.Security.OAuth" version="3.0.1" targetFramework="net452" />
  <package id="Microsoft.Owin.Security.Twitter" version="3.0.1" targetFramework="net452" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net452" />
  <package id="Modernizr" version="2.6.2" targetFramework="net452" />
  <package id="Newtonsoft.Json" version="6.0.4" targetFramework="net452" />
  <package id="Owin" version="1.0" targetFramework="net452" />
  <package id="Respond" version="1.2.0" targetFramework="net452" />
  <package id="WebGrease" version="1.5.2" targetFramework="net452" />
</packages>

Answer 1

有错误，当我创建另外两个项目时，它们都运行良好。