预检请求返回 404 Not Found for Controllers in a Area
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【中文标题】预检请求返回 404 Not Found for Controllers in a Area【英文标题】：Preflight request returns 404 Not Found for Controllers in an Area 【发布时间】：2014-09-16 12:03:15 【问题描述】：我有一个 WebAPI 项目，并按照以下步骤启用了 CORS：
-
获取 nuget 包：
Install-Package Microsoft.AspNet.WebApi.Cors。
在 WebApiConfig.cs 中添加了 config.EnableCors();。
已将[EnableCors(origins: "*", headers: "*", methods: "*")] 添加到我的控制器中。
我的控制器位于根 Controllers 文件夹中，并且位于区域内。
/Controllers/ValuesController
/Areas/TestArea/Controllers/OtherStuffController
两个控制器都有[EnableCors(...)] 属性。
我的问题是只有 ValuesController 有效。
使用 Fiddler 检查OtherStuffController 的请求，我可以看到客户端发送了一个预检 OPTIONS 请求，但服务器响应为 404 未找到而不是 200 OK，但 ValuesController 工作正常。
我做错了什么？为什么 TestArea 区域的控制器不能处理 CORS 请求，而 Values 控制器却可以？
这两个控制器除了名称没有什么不同，而且它在一个区域中。
附加信息
路线：
// In WebApiConfig.cs
config.Routes.MapHttpRoute("DefaultApi", "controller/id",
new id = RouteParameter.Optional );
// In Areas/TestArea/TestAreaAreaRegistration.cs
context.MapRoute("TestArea_default","TestArea/controller/id",
new id = UrlParameter.Optional);
我用来访问操作方法的 URL：
http://localhxst:57578/values
http://localhxst:57578/testarea/otherstuff
值请求（工作）：
(REQUEST)
OPTIONS http://localhost:57578/values HTTP/1.1
Host: localhost:57578
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-gb,en;q=0.5
Accept-Encoding: gzip, deflate
Origin: http://localhxst:12345
Access-Control-Request-Method: GET
Access-Control-Request-Headers: authorization
Connection: keep-alive
(RESPONSE)
HTTP/1.1 200 OK
Cache-Control: no-cache
Pragma: no-cache
Expires: -1
Server: Microsoft-IIS/8.0
Access-Control-Allow-Origin: *
Access-Control-Allow-Headers: authorization
X-AspNet-Version: 4.0.30319
X-SourceFiles: =?UTF-8?B?QzpcVXNlcnNcYmVuLmdvbGRlblxEb2N1bWVudHNcV29ya1xWb2ljZVNpbXBsaWZpZWRcQVBJXFZvaWNlU2ltcGxpZmllZC5QdWJsaWNBUElcdmFsdWVz?=
X-Powered-By: ASP.NET
Date: Thu, 24 Jul 2014 20:12:56 GMT
Content-Length: 0
接着是：
(REQUEST)
GET http://localhxst:57578/values HTTP/1.1
Host: localhost:57578
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0
Accept: application/json
Accept-Language: en-gb,en;q=0.5
Accept-Encoding: gzip, deflate
Authorization: Bearer HQkpyzeQ5NM1Va1Ow__6N6JzuRdMweDIJDneDQer1tL1uMhkrG4gsRYkXLQ1F4782L5vDTMOkoqvOEtO753n6TJ2BU-KNaxdXRAtf336c-r8MXMi_nWliw1vT1Xa7Wmt3eV5b9HmJR4Bnmt4gTavtoC0qwQVsoX_miV_VanJ98j_aaoNdNNZcnN5FsJ2eoLx7UebBDxXBMFmXEtOUTtWCsRp-g26mwKjbK3HeDoiUU2Ivh-VleUVImdh9ASwInbZ
Referer: http://localhxst:12345/
Origin: http://localhxst:12345
Connection: keep-alive
(RESPONSE)
HTTP/1.1 200 OK
Cache-Control: no-cache
Pragma: no-cache
Content-Type: application/json; charset=utf-8
Expires: -1
Server: Microsoft-IIS/8.0
Access-Control-Allow-Origin: *
X-AspNet-Version: 4.0.30319
X-SourceFiles: =?UTF-8?B?QzpcVXNlcnNcYmVuLmdvbGRlblxEb2N1bWVudHNcV29ya1xWb2ljZVNpbXBsaWZpZWRcQVBJXFZvaWNlU2ltcGxpZmllZC5QdWJsaWNBUElcdmFsdWVz?=
X-Powered-By: ASP.NET
Date: Thu, 24 Jul 2014 20:12:56 GMT
Content-Length: 13
["ABC","DEF"]
OtherStuff 请求（预照明失败）：
(REQUEST)
OPTIONS http://localhxst:57578/testarea/otherstuff HTTP/1.1
Host: localhost:57578
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Firefox/31.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-gb,en;q=0.5
Accept-Encoding: gzip, deflate
Origin: http://localhost:12345
Access-Control-Request-Method: GET
Access-Control-Request-Headers: authorization
Connection: keep-alive
(RESPONSE)
HTTP/1.1 404 Not Found
Cache-Control: private
Content-Type: text/html; charset=utf-8
Server: Microsoft-IIS/8.0
X-AspNet-Version: 4.0.30319
X-SourceFiles: =?UTF-8?B?QzpcVXNlcnNcYmVuLmdvbGRlblxEb2N1bWVudHNcV29ya1xWb2ljZVNpbXBsaWZpZWRcQVBJXFZvaWNlU2ltcGxpZmllZC5QdWJsaWNBUElcdGVzdGFyZWFcb3RoZXJzdHVmZg==?=
X-Powered-By: ASP.NET
Date: Thu, 24 Jul 2014 20:35:08 GMT
Content-Length: 3194
<!DOCTYPE html>
<html>
<head>
<title>The resource cannot be found.</title>
<meta name="viewport" content="width=device-width" />
<style>
body font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;
p font-family:"Verdana";font-weight:normal;color:black;margin-top: -5px
b font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px
H1 font-family:"Verdana";font-weight:normal;font-size:18pt;color:red
H2 font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon
pre font-family:"Consolas","Lucida Console",Monospace;font-size:11pt;margin:0;padding:0.5em;line-height:14pt
.marker font-weight: bold; color: black;text-decoration: none;
.version color: gray;
.error margin-bottom: 10px;
.expandable text-decoration:underline; font-weight:bold; color:navy; cursor:hand;
@media screen and (max-width: 639px)
pre width: 440px; overflow: auto; white-space: pre-wrap; word-wrap: break-word;
@media screen and (max-width: 479px)
pre width: 280px;
</style>
</head>
<body bgcolor="white">
<span><H1>Server Error in '/' Application.<hr width=100% size=1 color=silver></H1>
<h2> <i>The resource cannot be found.</i> </h2></span>
<font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif ">
<b> Description: </b>HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.
<br><br>
<b> Requested URL: </b>/testarea/otherstuff<br><br>
<hr width=100% size=1 color=silver>
<b>Version Information:</b> Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34009
</font>
</body>
</html>
<!--
[HttpException]: The controller for path '/testarea/otherstuff' was not found or does not implement IController.
at System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType)
at System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext requestContext, String controllerName)
at System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& controller, IControllerFactory& factory)
at System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state)
at System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state)
at System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
-->
ValuesController.cs
namespace MyAPIApp.PublicAPI.Controllers
[EnableCors(origins: "*", headers: "*", methods: "*")]
[Authorize]
public class ValuesController : ApiController
private static readonly List<string> values = new List<string> "ABC", "DEF" ;
public IEnumerable<string> Get() return values;
OtherStuffController.cs
namespace MyAPIApp.PublicAPI.Areas.TestArea.Controllers
[EnableCors(origins: "*", headers: "*", methods: "*")]
[Authorize]
public class OtherStuffController : ApiController
private static readonly List<string> values = new List<string> "ABC", "DEF" ;
public IEnumerable<string> Get() return values;
【问题讨论】：
你能发布你试图查询的 URI，没有域吗？。 路由配置会有所帮助。 @Machinarius：添加了附加信息。 您是否检查过 TestAreaAreaRegistration.cs 是否正在被调用以注册其路由？也许您还想使用MapHttpRoute 而不是MapRoute
@Sabacc：是的，MapHttpRoute 与 MapRoute 是个问题，谢谢。在将额外信息添加到我的帖子并并排查看两个路线定义后，我解决了这个问题。
【参考方案1】：
我找到了问题。
当您通过“添加”>“区域”上下文菜单在项目中创建区域时，Visual Studio 会使用以下代码使用 AreaRegistration 模板创建区域：
public override void RegisterArea(AreaRegistrationContext context)
context.MapRoute(
"TestArea_default",
"TestArea/controller/id",
new id = UrlParameter.Optional
);
但是，此代码不适用于 ApiController。正确的路线注册码是：
public override void RegisterArea(AreaRegistrationContext context)
context.Routes.MapHttpRoute(
"TestArea_default",
"TestArea/controller/id",
new id = RouteParameter.Optional );
事实证明这与 CORS 无关。
【讨论】：
【参考方案2】：我通过在configuration\system.webServer\handlers 下的Web.config 文件中删除以下行来解决此问题：
<remove name="OPTIONSVerbHandler" />
【讨论】：
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