在IIS7上启用跨域资源共享

Question 1

我最近遇到了将Javascript请求发布到另一个域的问题。默认情况下，不允许将XHR发布到其他域。

按照http://enable-cors.org/的说明，我在另一个域上启用了此功能。

<?xml version="1.0" encoding="utf-8"?>
<configuration>
 <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>
</configuration>

在此处输入图片说明

现在一切正常，但是在返回有效的200响应之前，它仍然返回405响应。

Request URL:http://testapi.nottherealsite.com/api/Reporting/RunReport
Request Method:OPTIONS
Status Code:405 Method Not Allowed
Request Headersview source
Accept:*/*
Accept-Charset:ISO-8859-1,utf-8;q=0.7,*;q=0.3
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-GB,en-US;q=0.8,en;q=0.6
Access-Control-Request-Headers:origin, content-type, accept
Access-Control-Request-Method:POST
Connection:keep-alive
Host:testapi.nottherealsite.com
Origin:http://test.nottherealsite.com
Referer:http://test.nottherealsite.com/Reporting
User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1
Response Headersview source
Access-Control-Allow-Headers:Content-Type
Access-Control-Allow-Methods:GET,PUT,POST,DELETE,OPTIONS
Access-Control-Allow-Origin:*
Allow:POST
Cache-Control:private
Content-Length:1565
Content-Type:text/html; charset=utf-8
Date:Tue, 18 Sep 2012 14:26:06 GMT
Server:Microsoft-IIS/7.5
X-AspNet-Version:4.0.30319
X-Powered-By:ASP.NET

更新：2014年3月2日

MSDN杂志上有最近更新的文章。详细介绍ASP.NET Web API中的CORS支持2。

http://msdn.microsoft.com/zh-CN/magazine/dn532203.aspx

Question 2

IIS 7可能会“处理” HTTP OPTIONS响应，而不是由您的应用程序指定它。为了确定这一点，在IIS7中，

转到您网站的处理程序映射。
向下滚动到“ OPTIONSVerbHandler”。
将“ ProtocolSupportModule”更改为“ IsapiHandler”
设置可执行文件：％windir％\ Microsoft.NET \ Framework \ v4.0.30319 \ aspnet_isapi.dll

现在，当您发送HTTP OPTIONS动词时，上面的配置条目就会启动。

或者，您可以在BeginRequest方法中响应HTTP OPTIONS动词。

    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, PUT, DELETE");
            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept");
            HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000" );
            HttpContext.Current.Response.End();
        }

    }

Question 3

我无法发表评论，因此我必须将其放在单独的答案中，但这与Shah接受的答案有关。

最初，我通过重新配置IIS中的OPTIONSVerbHandler来遵循Shahs的回答（谢谢！），但是当我重新部署应用程序时，恢复了我的设置。

我最终在我的Web.config中删除了OPTIONSVerbHandler。

<handlers>
    <remove name="OPTIONSVerbHandler"/>
</handlers>

Question 4

我发现在http://help.infragistics.com/Help/NetAdvantage/jQuery/2013.1/CLR4.0/html/igOlapXmlaDataSource_Configuring_IIS_for_Cross_Domain_OLAP_Data.html上找到的信息对于在IIS 7中为WCF服务设置HTTP选项非常有用。

我将以下内容添加到web.config中，然后将IIS 7“处理程序映射”列表中的OPTIONSVerbHandler移至列表顶部。我还通过双击处理程序映射部分中的处理程序，然后在“请求限制”上，然后单击访问选项卡，对OPTIONSVerbHander进行了读取访问。

不幸的是，我很快发现IE似乎不支持向其XDomainRequest对象添加标头（将Content-Type设置为text / xml并添加SOAPAction标头）。

我只想分享这一点，因为我花了大部分时间寻找如何处理它。

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

Question 5

405响应是“方法不允许”响应。听起来您的服务器未正确配置为处理CORS预检请求。您需要做两件事：

1）启用IIS7以响应HTTP OPTIONS请求。您收到405，因为IIS7拒绝了OPTIONS请求。我不知道如何执行此操作，因为我不熟悉IIS7，但是可能在Stack Overflow上有其他人在做。

2）配置您的应用程序以响应CORS飞行前请求。您可以通过Access-Control-Allow-Origin在该<customHeaders>部分中的行下面添加以下两行来做到这一点：

<add name="Access-Control-Allow-Methods" value="GET,PUT,POST,DELETE" />
<add name="Access-Control-Allow-Headers" value="Content-Type" />

您可能必须Access-Control-Allow-Headers根据您的请求要求的标题将其他值添加到该部分。您有发出请求的示例代码吗？

您可以在此处了解有关CORS和CORS预检的更多信息：http : //www.html5rocks.com/en/tutorials/cors/

Question 6

从DavidG阐述的答案实际上接近基本解决方案的要求：

首先，将OPTIONSVerbHandler配置为在.Net处理程序之前执行。
1. 在IIS控制台中，选择“处理程序映射”（在服务器级别或站点级别；请注意，在站点级别它将重新定义站点的所有处理程序，并忽略此后在服务器级别所做的任何更改；当然，在服务器级别，如果其他站点需要自己处理选项动词，则可能会破坏这些站点）。
2. 在“操作”窗格中，选择“查看有序列表...”，找到OPTIONSVerbHandler，然后将其上移（许多点击...）。
您也可以在web.config中通过重新定义下面的所有处理程序来完成此操作<system.webServer><handlers>（<clear>然后将<add ...>它们重新定义，这就是IIS控制台为您所做的事情）（顺便说一句，无需请求对此处理程序的“读取”权限。）

其次，为您的cors需求配置自定义http标头，例如：

<system.webServer>
  <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="POST,GET,OPTIONS"/>
    </customHeaders>
  </httpProtocol>
</system.webServer>

您也可以在IIS控制台中执行此操作。

这是一个基本的解决方案，因为它即使在不需要它的情况下也会发送cors标头。但是，使用WCF，看起来像是最简单的一种。

使用MVC或webapi，我们可以改为通过代码（“手动”或具有最新版本的webapi中提供的内置支持）处理OPTIONS动词和cors标头。

Question 7

使用ASP.net Web API 2通过nuget安装Microsoft ASP.NET Cross Origin支持。

http://enable-cors.org/server_aspnet.html

public static void Register(HttpConfiguration config)
{
 var enableCorsAttribute = new EnableCorsAttribute("http://mydomain.com",
                                                   "Origin, Content-Type, Accept",
                                                   "GET, PUT, POST, DELETE, OPTIONS");
        config.EnableCors(enableCorsAttribute);
}

Question 8

我的解决方案是添加：

<system.webServer>
    <modules runAllManagedModulesForAllRequests="true">
      <remove name="WebDAVModule"/>
    </modules>
</system.webServer>

到我的web.config

Question 9

Alsalaam Aleykum。

第一种方法是按照此链接中的说明进行操作：

http://help.infragistics.com/Help/NetAdvantage/jQuery/2013.1/CLR4.0/html/igOlapXmlaDataSource_Configuring_IIS_for_Cross_Domain_OLAP_Data.html

对应于以下配置：

<handlers>
  <clear />
  <add name="OPTIONSVerbHandler" path="*" verb="OPTIONS" type="" modules="ProtocolSupportModule" scriptProcessor="" resourceType="Unspecified" requireAccess="Read" allowPathInfo="false" preCondition="" responseBufferLimit="4194304" />
  <add name="xamlx-ISAPI-4.0_64bit" path="*.xamlx" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="4194304" />
  <add name="xamlx-ISAPI-4.0_32bit" path="*.xamlx" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="4194304" />
  <add name="xamlx-Integrated-4.0" path="*.xamlx" verb="GET,HEAD,POST,DEBUG" type="System.Xaml.Hosting.XamlHttpHandlerFactory, System.Xaml.Hosting, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" modules="ManagedPipelineHandler" scriptProcessor=""
  resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="integratedMode,runtimeVersionv4.0" responseBufferLimit="4194304" />
  <add name="rules-ISAPI-4.0_64bit" path="*.rules" verb="*" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="classicMode,runtimeVersionv4.0,bitness64"
  responseBufferLimit="4194304" />
  <add name="rules-ISAPI-4.0_32bit" path="*.rules" verb="*" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="classicMode,runtimeVersionv4.0,bitness32"
  responseBufferLimit="4194304" />
  <add name="rules-Integrated-4.0" path="*.rules" verb="*" type="System.ServiceModel.Activation.ServiceHttpHandlerFactory, System.ServiceModel.Activation, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" modules="ManagedPipelineHandler"
  scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="integratedMode,runtimeVersionv4.0" responseBufferLimit="4194304" />
  <add name="xoml-ISAPI-4.0_64bit" path="*.xoml" verb="*" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="classicMode,runtimeVersionv4.0,bitness64"
  responseBufferLimit="4194304" />
  <add name="xoml-ISAPI-4.0_32bit" path="*.xoml" verb="*" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="classicMode,runtimeVersionv4.0,bitness32"
  responseBufferLimit="4194304" />
  <add name="xoml-Integrated-4.0" path="*.xoml" verb="*" type="System.ServiceModel.Activation.ServiceHttpHandlerFactory, System.ServiceModel.Activation, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" modules="ManagedPipelineHandler"
  scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="integratedMode,runtimeVersionv4.0" responseBufferLimit="4194304" />
  <add name="svc-ISAPI-4.0_64bit" path="*.svc" verb="*" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="classicMode,runtimeVersionv4.0,bitness64"
  responseBufferLimit="4194304" />
  <add name="svc-ISAPI-4.0_32bit" path="*.svc" verb="*" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="classicMode,runtimeVersionv4.0,bitness32"
  responseBufferLimit="4194304" />
  <add name="svc-Integrated-4.0" path="*.svc" verb="*" type="System.ServiceModel.Activation.ServiceHttpHandlerFactory, System.ServiceModel.Activation, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" modules="ManagedPipelineHandler" scriptProcessor=""
  resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="integratedMode,runtimeVersionv4.0" responseBufferLimit="4194304" />
  <add name="ISAPI-dll" path="*.dll" verb="*" type="" modules="IsapiModule" scriptProcessor="" resourceType="File" requireAccess="Execute" allowPathInfo="true" preCondition="" responseBufferLimit="4194304" />
  <add name="AXD-ISAPI-4.0_64bit" path="*.axd" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
  <add name="PageHandlerFactory-ISAPI-4.0_64bit" path="*.aspx" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
  <add name="SimpleHandlerFactory-ISAPI-4.0_64bit" path="*.ashx" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script"
  allowPathInfo="false" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
  <add name="WebServiceHandlerFactory-ISAPI-4.0_64bit" path="*.asmx" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script"
  allowPathInfo="false" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
  <add name="HttpRemotingHandlerFactory-rem-ISAPI-4.0_64bit" path="*.rem" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script"
  allowPathInfo="false" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
  <add name="HttpRemotingHandlerFactory-soap-ISAPI-4.0_64bit" path="*.soap" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script"
  allowPathInfo="false" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
  <add name="aspq-ISAPI-4.0_64bit" path="*.aspq" verb="*" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="classicMode,runtimeVersionv4.0,bitness64"
  responseBufferLimit="0" />
  <add name="cshtm-ISAPI-4.0_64bit" path="*.cshtm" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
  <add name="cshtml-ISAPI-4.0_64bit" path="*.cshtml" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
  <add name="vbhtm-ISAPI-4.0_64bit" path="*.vbhtm" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
  <add name="vbhtml-ISAPI-4.0_64bit" path="*.vbhtml" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
  <add name="TraceHandler-Integrated-4.0" path="trace.axd" verb="GET,HEAD,POST,DEBUG" type="System.Web.Handlers.TraceHandler" modules="ManagedPipelineHandler" scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="integratedMode,runtimeVersionv4.0"
  responseBufferLimit="4194304" />
  <add name="WebAdminHandler-Integrated-4.0" path="WebAdmin.axd" verb="GET,DEBUG" type="System.Web.Handlers.WebAdminHandler" modules="ManagedPipelineHandler" scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="integratedMode,runtimeVersionv4.0"
  responseBufferLimit="4194304" />
  <add name="AssemblyResourceLoader-Integrated-4.0" path="WebResource.axd" verb="GET,DEBUG" type="System.Web.Handlers.AssemblyResourceLoader" modules="ManagedPipelineHandler" scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="integratedMode,runtimeVersionv4.0" responseBufferLimit="4194304" />
  <add name="PageHandlerFactory-Integrated-4.0" path="*.aspx" verb="GET,HEAD,POST,DEBUG" type="System.Web.UI.PageHandlerFactory" modules="ManagedPipelineHandler" scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="integratedMode,runtimeVersionv4.0" responseBufferLimit="4194304" />
  <add name="SimpleHandlerFactory-Integrated-4.0" path="*.ashx" verb="GET,HEAD,POST,DEBUG" type="System.Web.UI.SimpleHandlerFactory" modules="ManagedPipelineHandler" scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="integratedMode,runtimeVersionv4.0" responseBufferLimit="4194304" />
  <add name="WebServiceHandlerFactory-Integrated-4.0" path="*.asmx" verb="GET,HEAD,POST,DEBUG" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" modules="ManagedPipelineHandler"
  scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="integratedMode,runtimeVersionv4.0" responseBufferLimit="4194304" />
  <add name="HttpRemotingHandlerFactory-rem-Integrated-4.0" path="*.rem" verb="GET,HEAD,POST,DEBUG" type="System.Runtime.Remoting.Channels.Http.HttpRemotingHandlerFactory, System.Runtime.Remoting, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
  modules="ManagedPipelineHandler" scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="integratedMode,runtimeVersionv4.0" responseBufferLimit="4194304" />
  <add name="HttpRemotingHandlerFactory-soap-Integrated-4.0" path="*.soap" verb="GET,HEAD,POST,DEBUG" type="System.Runtime.Remoting.Channels.Http.HttpRemotingHandlerFactory, System.Runtime.Remoting, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
  modules="ManagedPipelineHandler" scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="integratedMode,runtimeVersionv4.0" responseBufferLimit="4194304" />
  <add name="aspq-Integrated-4.0" path="*.aspq" verb="GET,HEAD,POST,DEBUG" type="System.Web.HttpForbiddenHandler" modules="ManagedPipelineHandler" scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="integratedMode,runtimeVersionv4.0"
  responseBufferLimit="4194304" />
  <add name="cshtm-Integrated-4.0" path="*.cshtm" verb="GET,HEAD,POST,DEBUG" type="System.Web.HttpForbiddenHandler" modules="ManagedPipelineHandler" scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="integratedMode,runtimeVersionv4.0"
  responseBufferLimit="4194304" />
  <add name="cshtml-Integrated-4.0" path="*.cshtml" verb="GET,HEAD,POST,DEBUG" type="System.Web.HttpForbiddenHandler" modules="ManagedPipelineHandler" scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="integratedMode,runtimeVersionv4.0"
  responseBufferLimit="4194304" />
  <add name="vbhtm-Integrated-4.0" path="*.vbhtm" verb="GET,HEAD,POST,DEBUG" type="System.Web.HttpForbiddenHandler" modules="ManagedPipelineHandler" scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="integratedMode,runtimeVersionv4.0"
  responseBufferLimit="4194304" />
  <add name="vbhtml-Integrated-4.0" path="*.vbhtml" verb="GET,HEAD,POST,DEBUG" type="System.Web.HttpForbiddenHandler" modules="ManagedPipelineHandler" scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="integratedMode,runtimeVersionv4.0"
  responseBufferLimit="4194304" />
  <add name="ScriptHandlerFactoryAppServices-Integrated-4.0" path="*_AppService.axd" verb="*" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" modules="ManagedPipelineHandler"
  scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="integratedMode,runtimeVersionv4.0" responseBufferLimit="4194304" />
  <add name="ScriptResourceIntegrated-4.0" path="*ScriptResource.axd" verb="GET,HEAD" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" modules="ManagedPipelineHandler"
  scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="integratedMode,runtimeVersionv4.0" responseBufferLimit="4194304" />
  <add name="AXD-ISAPI-4.0_32bit" path="*.axd" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
  <add name="PageHandlerFactory-ISAPI-4.0_32bit" path="*.aspx" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
  <add name="SimpleHandlerFactory-ISAPI-4.0_32bit" path="*.ashx" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
  <add name="WebServiceHandlerFactory-ISAPI-4.0_32bit" path="*.asmx" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script"
  allowPathInfo="false" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
  <add name="HttpRemotingHandlerFactory-rem-ISAPI-4.0_32bit" path="*.rem" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script"
  allowPathInfo="false" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
  <add name="HttpRemotingHandlerFactory-soap-ISAPI-4.0_32bit" path="*.soap" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script"
  allowPathInfo="false" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
  <add name="aspq-ISAPI-4.0_32bit" path="*.aspq" verb="*" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false" preCondition="classicMode,runtimeVersionv4.0,bitness32"
  responseBufferLimit="0" />
  <add name="cshtm-ISAPI-4.0_32bit" path="*.cshtm" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
  <add name="cshtml-ISAPI-4.0_32bit" path="*.cshtml" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
  <add name="vbhtm-ISAPI-4.0_32bit" path="*.vbhtm" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
  <add name="vbhtml-ISAPI-4.0_32bit" path="*.vbhtml" verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
  <add name="TRACEVerbHandler" path="*" verb="TRACE" type="" modules="ProtocolSupportModule" scriptProcessor="" resourceType="Unspecified" requireAccess="None" allowPathInfo="false" preCondition="" responseBufferLimit="4194304" />
  <add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
  <add name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*." verb="GET,HEAD,POST,DEBUG" type="" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
  <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG" type="System.Web.Handlers.TransferRequestHandler" modules="ManagedPipelineHandler" scriptProcessor="" resourceType="Unspecified" requireAccess="Script" allowPathInfo="false"
  preCondition="integratedMode,runtimeVersionv4.0" responseBufferLimit="0" />
  <add name="StaticFile" path="*" verb="*" type="" modules="StaticFileModule,DefaultDocumentModule,DirectoryListingModule" scriptProcessor="" resourceType="Either" requireAccess="Read" allowPathInfo="false" preCondition="" responseBufferLimit="4194304"
  />
</handlers>

展开摘要

第二种方法是在BeginRequest方法中响应HTTP OPTIONS动词。

  protected void Application_BeginRequest(object sender, EventArgs e)
{
    HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*");
    if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
    {
        HttpContext.Current.Response.AddHeader("Access-Control-Request-Method", "GET ,POST, PUT, DELETE");

        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Origin,Content-Type, Accept");
        HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "86400"); // 24 hours
        HttpContext.Current.Response.End();
    }
}

Question 10

Microsoft花了多年的时间来找出差距，并交付了带外CORS模块来解决此问题。

从Microsoft安装模块
使用摘要配置它

如下

<configuration>
    <system.webServer>
        <cors enabled="true" failUnlistedOrigins="true">            
            <add origin="http://*" allowed="true" />
        </cors>
    </system.webServer>
</configuration>

通常，它比自定义标题容易得多，并且还可以更好地处理预检请求。

如果IIS Express需要相同的功能，请使用我编写的某些PowerShell脚本。

Question 11

这些答案中未提及的一件事是，如果您使用的是IIS，并且子应用程序具有各自独立的web.config，则可能需要在包含以下代码的父目录中具有web.config。

<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="POST,GET,OPTIONS"/>
  </customHeaders>
</httpProtocol>