You can use an asterisk (*) to apply this rule to all origin request header values. Specifies origin host on which to impose an origin rule. The element of the collection specifies an individual origin to be added to the list of origin rules. Specifies whether the CORS response status code to be set with 403 if the requested origin is not matched to the configured list of origin or if the origin host is configured to be disallowed. Customize the CORS response header values with the configured values.Configure a list of origin domains which should be disallowed as CORS request.Configure wild card origin host domains when configuring the list of origin domain such as or.Configure the list of specific origin host domains and allow only the CORS request which has the same value of the origin request header as one of listed origin host domains.Configure all the origin host domains to be accepted with * origin host rule.Enable, disable CORS for a whole IIS server or for a specific IIS site, an application, a virtual directory, a physical directory or a file (system.webServer/cors).For the host origin, the CORS response is customized with various CORS configurations as an example. The * origin allows all host origins however, those that start with are later excluded. The IIS CORS is configured via a site or application web.config file and has its own cors configuration section within system.webServer.īelow are the configuration examples to enable CORS for a site named contentSite. The OPTIONS requests are always anonymous, so CORS module provides IIS servers a way to correctly respond to the preflight request even if anonymous authentification needs to be disabled server-wise. The IIS CORS module is designed to handle the CORS preflight requests before other IIS modules handle the same request. The CORS preflight uses the HTTP OPTIONS method with the ACCESS-CONTROL-REQUEST-METHOD and the ORIGIN request headers. CORS preflight requestĪ CORS preflight request is used to determine whether the resource being requested is set to be shared across origins by the server. When the CORS module is used, IIS will inform clients whether a cross-origin request can be performed based on the IIS configuration. When CORS is not used, cross-origin requests will be blocked by the client. This scenario is known as a cross-origin request. Usually, web browsers act as the client-side CORS component, while the IIS server works as the server-side CORS component with the help of the IIS CORS module.Ī CORS request occurs when a protocol aware client, such as a web browser, makes a request to a domain (origin) that differs from the current domain. The CORS protocol governs client/server communication. IIS CORS module is a server-side CORS component These CORS rules can be easily defined or configured making it simple to delegate all CORS protocol handling to the module. The module's handling of CORS requests is determined by rules defined in the configuration. With this module, developers can move CORS logic out of their applications and rely on the web server. The IIS CORS module provides a way for web server administrators and web site authors to make their applications support the CORS protocol. The Microsoft IIS CORS Module is an extension that enables web sites to support the CORS(Cross-Origin Resource Sharing) protocol. This article provides an overview of the IIS CORS module and explains the configuration of the module.
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