webapi跨域使用session webapi跨域使用session的方法示例（web前端跨域）

@{
  ViewBag.Title = "TestSetSession";
}

<h2>TestSetSession</h2>

<button onclick="Set()">设置session</button>

@section scripts{
<script src="~/Scripts/jquery-1.10.2.min.js"></script>
  <script>
    function Set() {
      $.ajax({
        url: "http://localhost:1338/api/Test/SetSession?session=1234567fdsdfghjhgfds",
        dataType: "json",
        xhrFields: {
          withCredentials: true
        },
        crossDomain: true,
        data: {},
        type: "post",
        success: function (data) {
          alert(data.message)
        },
        error: function () {
          alert('服务器发生错误！');
        }
      });
    }
  </script>
}

@{
  ViewBag.Title = "TestGetSession";
}

<h2>TestGetSession</h2>
<button onclick="Get()">获取session</button>

@section scripts{
<script src="~/Scripts/jquery-1.10.2.min.js"></script>
  <script>
    function Get() {
      $.ajax({
        url: "http://localhost:1338/api/Test/GetSession",
        dataType: "json",
        xhrFields: {
          withCredentials: true
        },
        crossDomain: true,
        data: {},
        type: "get",
        success: function (data) {
          alert("session:" + data.data.session_state + ",cookie:" + data.data.cookie);
        },
        error: function () {
          alert('服务器发生错误！');
        }
      });
    }
  </script>
}

public override void Init()
    {
      PostAuthenticateRequest += MvcApplication_PostAuthenticateRequest;
      base.Init();
    }

    void MvcApplication_PostAuthenticateRequest(object sender, EventArgs e)
    {
      System.Web.HttpContext.Current.SetSessionStateBehavior(
        System.Web.SessionState.SessionStateBehavior.Required);
    }

 //允许跨域
  config.EnableCors(new EnableCorsAttribute("*", "*", "*"));

[EnableCors("http://localhost:6477,http://localhost:6478", "*","*")]
  public class TestController : ApiController
  {
    /// <summary>
    /// 设置session
    /// </summary>
    /// <returns></returns>
    public dynamic SetSession(string session)
    {
      HttpContext.Current.Response.AddHeader("Access-Control-Allow-Credentials", "true");
      //缓存state
      HttpContext.Current.Session["session_test"] = session;
      HttpCookie cookie = new HttpCookie("cookie_test")
      {
        Value = session,
        Expires = DateTime.Now.AddHours(1)
      };
      HttpContext.Current.Response.Cookies.Add(cookie);
      return new 
      {
        success = true,
        message = "设置session"
      };
    }

    /// <summary>
    /// 获取session
    /// </summary>
    /// <returns></returns>
    public dynamic GetSession()
    {
      HttpContext.Current.Response.AddHeader("Access-Control-Allow-Credentials", "true");
      var session = HttpContext.Current.Session["session_test"];
      HttpCookie _cookie = HttpContext.Current.Request.Cookies["cookie_test"];
      var cookie = _cookie?.Value??"";
      string session_state = session == null ? "" : session.ToString();
      return new 
      {
        success = true,
        message = "获取session",
        data = new { session_state, cookie }
      };
    }