预检的响应具有无效的HTTP状态代码400-ASPX [英] Response for preflight has invalid HTTP status code 400 - aspx

问题描述

我正在使用Visual Studio 2015编写服务器和客户端. 在Chrome和FireFox中会出现以下问题，但在资源管理器中可以完美运行. 我正在使用AJAX到我的服务器上进行Rest发帖，即AJAX代码:

I am writing both server and client using visual studio 2015. The following problem occurs in Chrome and FireFox, but works perfect in Explorer. I am doing a Rest post call using AJAX to my server, the AJAX code:

function CheckIntegrityExecution() {
    var request = ...
    var reqJson = JSON.stringify(request);
    $.ajax({
        type: "POST",
        url: "http://localhost:55857/api/post/flow",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        data: reqJson,
        success: function (jsonData) {
            ...
        },
        error: function () {
            alert("error");
        }
    });
}

最初我遇到405错误，并且通过添加

Initially I was getting 405 error, and this was fixed with adding

    var cors = new EnableCorsAttribute("http://localhost:55857", "*", "*");
    config.EnableCors(cors);

到Global.asax中的Register函数:

To the Register function in Global.asax:

public static void Register(HttpConfiguration config)

现在出现以下错误:

XMLHttpRequest cannot load http://localhost:55857/api/post/flow. Response for preflight has invalid HTTP status code 400

我服务器中的方法签名是

The method signature in my server is

[Route("api/post/flow")]
public HttpResponseMessage PostCommand([FromBody] dynamic value)

我在WebApi的Web.config中拥有这些配置.

And I have these configuration in my Web.config in the WebApi.

  <customHeaders>
    <add name="Access-Control-Allow-Origin" value="*" />
    <add name="Access-Control-Allow-Methods" value="OPTIONS, TRACE, GET, HEAD, POST, PUT" />
    <add name="Access-Control-Allow-Headers" value="Origin, Content-Type, Authorization, Accept, X-Requested-With" />
  </customHeaders>

我注意到，如果我删除

contentType: "application/json; charset=utf-8",

在Ajax请求中，我可以工作，但不会在服务器中获取数据.

from the Ajax request I will work, but I will not get the data in my server.

我不知道该怎么办，尝试了一切.

I have no ideas what to do, tried everything.

推荐答案

解决方案是将以下内容添加到Global.asax文件中

The solution was to add the following to the Global.asax file

protected void Application_BeginRequest()
{
    var context = HttpContext.Current;
    var response = context.Response;


    if (context.Request.HttpMethod == "OPTIONS")
    {
        response.AddHeader("Access-Control-Allow-Methods", "GET, POST, OPTIONS");
        response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept");
        response.End();
    }
}

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