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. The following example Lambda functions return the required CORS headers: Node.This article provides an overview of the IIS CORS module and explains the configuration of the module. Enabling CORS support for proxy integrationsįor a Lambda proxy integration or HTTP proxy integration, your backend is responsible for returning the Access-Control-Allow-Origin,Īccess-Control-Allow-Headers headers, because a proxy integration doesn't return an integration response. Modify the integration response to return theĪccess-Control-Allow-Origin header for all CORS-enabled methods for at least all 200 responses. This doesn’t always work, and sometimes you need to manually API Gateway creates an OPTIONS method and adds theĪccess-Control-Allow-Origin header to your existing method You can use the AWS Management Console to enable CORS. Enabling CORS for non-proxy integrations using the AWS Management Console You must configure your API to sendĪn appropriate response to the preflight request.Īccess-Control-Allow-Headers: 'Content-Type,X-Amz-Date,Authorization,X-Api-Key,X-Amz-Security-Token'Īfter creating the preflight request, you must return the Access-Control-Allow-Origin: '*' orĪccess-Control-Allow-Origin: 'origin' header for all CORS-enabled methods for at least all 200 responses. Request for credentials) from the server before sending the actual request. Protocol requires the browser to send a preflight request to the server and wait for approval (or a Your API's resources receive non-simple requests, you must enable additional CORS support depending on your integration type. Resource needs to include the header Access-Control-Allow-Origin: '*' or Access-Control-Allow-Origin: 'origin'.Īll other cross-origin HTTP requests are non-simple requests. įor simple cross-origin POST method requests, the response from your The request does not contain custom headers.Īny additional requirements that are listed in the Mozilla CORS documentation for simple requests. The request payload content type is text/plain, If it is a POST method request, it must include an It is issued against an API resource that allows only GET,
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