asp.net - IIS 7.5 的 CORS 设置

Question

如何转换以下代码以在 IIS 7.5 中的 web.config 中使用以及我应该将每段代码放置在 web.config 文件中的什么位置？

# Always set these headers.
Header always set Access-Control-Allow-Origin "*"
Header always set Access-Control-Allow-Methods "POST, GET, OPTIONS, DELETE, PUT"
Header always set Access-Control-Max-Age "1000"
Header always set Access-Control-Allow-Headers "x-requested-with, Content-Type, origin, authorization, accept, client-security-token"
 
# Added a rewrite to respond with a 200 SUCCESS on every OPTIONS request.
RewriteEngine On
RewriteCond %{REQUEST_METHOD} OPTIONS
RewriteRule ^(.*)$ $1 [R=200,L]

Answer 1

如果您要求此解决 CORS 问题，您可以按照下面的解决方案进行操作。

注意:在添加所有这些之前，您应该考虑安全问题。

1. 将其添加到您的 web.config 文件中:

   <system.webServer>
     <httpProtocol>
       <customHeaders>
         <add name="Access-Control-Allow-Origin" value="*" />
         <add name="Access-Control-Allow-Methods" value="GET, PUT, POST, DELETE, HEAD, OPTIONS" />
         <add name="Access-Control-Allow-Credentials" value="true"/>
         <add name="Access-Control-Allow-Headers" value="X-Requested-With, origin, content-type, accept" />
       </customHeaders>
     </httpProtocol>
   </system.webServer>
   

2. 如果您有内容类型 您的 ajax 调用中的参数或者您正在执行 PUT 请求。那些 被视为 PreFlight 请求。Preflight 请求正在执行 发送主请求(PUT、DELETE 等)之前的 OPTION 请求。您可以 将以下方法添加到您的 global.asax 文件中以成功传递 OPTION 过程:

   protected void Application_BeginRequest()
   {
       if (Request.Headers.AllKeys.Contains("Origin") && Request.HttpMethod == "OPTIONS")
       {
           Response.Flush();
       }
   }
   

To have more information about Preflight requests you can check here

For solution number 2 you can have detailed information from here