IIS 劫持 CORS Preflight OPTIONS 请求 [英] IIS hijacks CORS Preflight OPTIONS request

问题描述

我正在发出 CORS POST 请求并将 Content-Type 标头设置为 json.这会触发一个 Preflight OPTIONS 请求触发(这是好的和预期的)

I am making a CORS POST request and setting the Content-Type header to json. This triggers a Preflight OPTIONS request to fire (this is good and expected)

此 OPTIONS 请求以 200 OK 响应，但这不是来自我的 WebAPI 应用程序.

This OPTIONS request is responded to with a 200 OK but this isn't coming from my WebAPI application.

我有一个自定义消息处理程序，它永远不会被命中，所以请求在命中 ASP.NET 之前得到了 IIS 的响应.

I have a custom Message Handler in place and it never get's hit so the request is getting responded to by IIS prior to hitting ASP.NET it seems.

我找到了几个关于这个主题的帖子，他们说如下

I have found several posts on the subject and they say the following

1. 确保 WebDav 已卸载/删除/禁用 - 完成

确保 OPTIONSVerbHandler 已删除/更改为使用 aspnet_isapi.dll - 同时尝试

Make sure the OPTIONSVerbHandler is removed / changed to use aspnet_isapi.dll - TRIED BOTH

确保 extensionlessURLHandler 包含 OPTIONS 动词 - DONE

Make sure the extensionlessURLHandler includes the OPTIONS verb - DONE

但是，我的选项请求仍然被劫持.我的意思是，IIS 以 200 OK 响应，但在响应中不包含 Access-Control-Allow-Origin 标头.它不包含此标头，因为它永远不会访问设置此标头的我的 WebAPI CORS 代码.

However, my options request is still getting hijacked. By that I mean, IIS responds with at 200 OK but isn't including an Access-Control-Allow-Origin header in the response. It isn't including this header because it is never getting to my WebAPI CORS code that would set this header.

我能找到的两个听起来像我的问题的最好的帖子是

The two best posts I could find that sound like my issue are

这里:JQuery 卡在 CORS 预检和 IIS 幽灵响应

这里:http://brockallen.com/2012/10/18/cors-iis-and-webdav/

我尝试在 IIS 中打开失败请求跟踪 (FERB) 并将其设置为跟踪所有 200 个状态代码.我从来没有看到选项请求被记录...不确定这是否意味着 FERB 不跟踪 OPTIONS 请求，或者我是否需要更改 FERB 设置中的某些内容以使其跟踪 OPTIONS 请求，或者如果这是一个线索我的问题是什么?

I have tried turning on Failed Request tracing (FERB) in IIS and set it to trace all 200 status codes. I don't ever see the options request being logged... Not sure if this means FERB doesn't track OPTIONS requests or if I need to change something in the FERB settings to make it track OPTIONS requests, Or if this is a clue to what my problem is?

这是在 IIS 7.5 上运行的 ASP.NET WebAPI 2.0(也在 IIS 8 和 IISExpress 上进行了测试，结果相同)不管是什么浏览器(Chrome、FF 和 IE 都以同样的方式失败)

This is ASP.NET WebAPI 2.0 running on IIS 7.5 (Also tested on IIS 8 and IISExpress with same results) Doesn't matter what browser (Chrome, FF, and IE all fail the same way)

我已经尝试了所有我能找到的关于这个主题的方法，但仍然无法解决我的问题.

I have tried everything I can find on the subject and still can't fix my problem.

帮助我 StackOverflow，你是我唯一的希望.

Help me StackOverflow, you're my only hope.

推荐答案

你可以在这里尝试几件事，所有 web.config 相关的，首先修改你的 modules 元素以包含属性 runAllManagedModulesForAllRequests="true"，如下:

A couple of things you can try here, all web.config related, firstly modify your modules element to include the attribute runAllManagedModulesForAllRequests="true", as below:

<modules runAllManagedModulesForAllRequests="true">
    <remove name="WebDavModule" />
</modules>

然后将您的处理程序设置为以下:

Then set your handlers to the below:

<handlers>
   <remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />
   <remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />
   <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
   <remove name="WebDav" />
   <remove name="OPTIONSVerbHandler" />
   <add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" modules="IsapiModule" scriptProcessor="%windir%Microsoft.NETFrameworkv4.0.30319aspnet_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.NETFramework64v4.0.30319aspnet_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" />
</handlers>

这应该可以解决问题，但如果没有，作为最后的手段，您可以强制 IIS 使用以下内容输出正确的标头:

This should do the trick, but if it doesn't, as a last resort you can force IIS to output the correct headers with the below:

  <system.webServer>
    <httpProtocol>
      <customHeaders>
        <add name="Access-Control-Allow-Origin" value="*" />
        <add name="Access-Control-Allow-Methods" value="GET,PUT,POST,DELETE,OPTIONS" />
        <add name="Access-Control-Allow-Headers" value="Content-Type" />
      </customHeaders>
    </httpProtocol>
  </system.webServer>

注意通配符值，您应该将其设置为您的网站将托管的域名.

Be wary of the wildcard value, you should really set this to the domain name that your site will be hosted on.

这篇关于IIS 劫持 CORS Preflight OPTIONS 请求的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！