How do I enable Cross-Origin Resource Sharing on IIS 7?

Enabling Cross-Origin Resource Sharing on IIS 7

Cross-Origin Resource Sharing (CORS) is a mechanism that allows client applications to access resources from different domains. By default, browsers restrict cross-origin requests for security reasons. To enable CORS on IIS 7, follow these steps:

1. Configure the Web.config file:

   Add the following custom headers to the section:

   <code class="xml"><customheaders>
     <add name="Access-Control-Allow-Origin" value="*"></add>
     <add name="Access-Control-Allow-Methods" value="GET,PUT,POST,DELETE,OPTIONS"></add>
     <add name="Access-Control-Allow-Headers" value="Content-Type"></add>
   </customheaders></code>

2. Handle HTTP OPTIONS requests:

   By default, IIS 7 handles HTTP OPTIONS requests. To allow your application to handle these requests, modify the protocol support module for the 'OPTIONSVerbHandler' in IIS Manager:

   • Navigate to Handler Mappings for the site
   • Scroll down to 'OPTIONSVerbHandler'
   • Change 'ProtocolSupportModule' to 'IsapiHandler'
   • Set the executable: %windir%Microsoft.NETFrameworkv4.0.30319aspnet_isapi.dll

3. Alternatively, respond to HTTP OPTIONS in code:

   Add the following code to the Application_BeginRequest method in your application:

   <code class="csharp">protected void Application_BeginRequest(object sender, EventArgs e)
   {
       HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*");
   
       if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
       {
           // Handle "pre-flight" OPTIONS call
           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();
       }
   }</code>

By following these steps, you can enable CORS on IIS 7 and allow cross-domain resource sharing in your applications.

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