预检具有无效的HTTP状态代码404 Jquery AJAX POST

时间:2016-02-11 01:55:14

标签: javascript c# ajax asp.net-web-api cors

好吧,当它在控制台中出现此错误时,我真的很讨厌它。而且我知道 stackoverflow 充满了这些类型的问题。但是,我已经完成了研究,并且在我的Web API 2 Web服务中启用了CORS,我仍然遇到此错误。

这是我的Web API 2代码:

namespace WebApi.App.Controllers
{
    [EnableCors(origins: "*", headers: "*", methods: "*")]
    public class ServiceController : ApiController
    {
        [HttpGet]
        [Route("GetData")]
        public IHttpActionResult GetEmpData(DATAvars theDATA)
        {
            return Ok("WORKED! " + theDATA);            
        }

        [HttpPost]
        [Route("PostData")]
        public IHttpActionResult PostEmpData(DATAvars theDATA)
        {
            return Ok("WORKED! " + theDATA.theID);
        }

    }

    public class DATAvars
    {
        public string theID { get; set; }
        public string empImg { get; set; }
    }
}

<system.webServer>
<modules runAllManagedModulesForAllRequests="true">
  <remove name="WebDAVModule"/>
</modules>
<httpProtocol>
  <customHeaders>
    <add name="Access-Control-Allow-Origin" value="*" />
    <add name="Access-Control-Allow-Headers" value="Content-Type" />
    <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
  </customHeaders>
</httpProtocol>
<handlers>
  <remove name="WebDAV" />
  <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
  <remove name="OPTIONSVerbHandler" />
  <remove name="TRACEVerbHandler" />
  <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
</handlers>

namespace WebApi.App
{
    public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {
            config.Formatters.Clear();
            config.Formatters.Add(new JsonMediaTypeFormatter());
            config.MapHttpAttributeRoutes();
            config.EnableCors();
        }
    }
}

public class WebApiApplication : System.Web.HttpApplication
{
    protected void Application_Start()
    {
        GlobalConfiguration.Configure(WebApiConfig.Register);
    }

    protected void Application_BeginRequest(object sender, EventArgs e)
    {
    HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin" , "*");

    if (HttpContext.Current.Request.HttpMethod == "OPTIONS" )
    { 
        //These headers are handling the "pre-flight" OPTIONS call sent by the browser
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods" , "GET, POST" );
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers" , "Content-Type, Accept" );
        HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000");
        HttpContext.Current.Response.End();
    } 
    } 
}

然后我的AJAX调用代码(托管在另一个域上):

$.ajax({
    type: "POST",
    crossDomain: true,
    url: "http://dev-blahblah/newWS/PostData",
    beforeSend: function (xhrObj) {
        xhrObj.setRequestHeader("Content-Type", "application/json");
    },
    data: {
        theID: "2135648792",
        empImg: "false"
    },
    dataType: "json",
    success: function (data) {
        console.log(data);
    },
    error: function (XMLHttpRequest, textStatus, errorThrown) {
        console.log(XMLHttpRequest);
    }
});

这是控制台中的错误: enter image description here

控制台网络说: enter image description here

  

无法加载资源:服务器响应状态为404(未找到)   index.html:1 XMLHttpRequest无法加载http://dev-blahblah/newWS/PostData。预检的响应具有无效的HTTP状态代码404

现在这是SAME请求,但在 POSTMAN 中:

我花了 DAYS 试图解决这个问题并且无休止的googleing找到示例,我有,但似乎所有示例都不起作用。

我会非常感激让某人知道我需要做些什么才能让这个与JQUERY AJAX一起工作。

  

- 在CHROME = WORKS

中在同一个域上运行它      

- 在CHROME中的另一个域上运行它=不工作

     

- 在IE = WORKS

中的相同域上运行它      

- 在IE = WORKS

中的不同域上运行它

2 个答案:

答案 0 :(得分:0)

在我的Web API web.config文件中使用以下配置部分以避免404错误。

<handlers>
  <remove name="WebDAV"/>
  <remove name="OPTIONSVerbHandler" />
  <remove name="TRACEVerbHandler" />
  <remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />
  <remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />
  <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
  <add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
  <add name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
  <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
  <add name="OPTIONSVerbHandler" path="*" verb="OPTIONS" modules="ProtocolSupportModule" requireAccess="None" responseBufferLimit="4194304" />
</handlers>

答案 1 :(得分:0)

删除WebDAV对我不起作用,因为我的服务器上可能存在全局策略。然而,这削减了它:

<system.webServer>
    <security>
        <requestFiltering>
            <verbs applyToWebDAV="false">
                <add verb="DELETE" allowed="true" />
                <add verb="PUT" allowed="true" />
                <add verb="OPTIONS" allowed="true" />
            </verbs>
        </requestFiltering>
    </security>
</system.webServer>

<add verb="OPTIONS" allowed="true" />是有所作为的。