If a site specifies the header "Access-Control-Allow-Credentials:true", third-party sites may be able to carry out privileged actions and retrieve sensitive information. Note that in the CORS architecture, the Access-Control-Allow-Origin header is being set by the external web service ( ), not the original web application server ( Here, uses CORS to permit the browser to authorize to make requests to. The value of "*" is special in that it does not allow requests to supply credentials, meaning that it does not allow HTTP authentication, client-side SSL certificates, or cookies to be sent in the cross-domain request. A freely available web font on a public hosting service like Google Fonts is an example.Ī wildcard same-origin policy is also widely and appropriately used in the object-capability model, where pages have unguessable URLs and are meant to be accessible to anyone who knows the secret. An error page if the server does not allow a cross-origin request Ī wildcard same-origin policy is appropriate when a page or API response is intended to be accessible to any code on any site.The requested data along with an Access-Control-Allow-Origin (ACAO) header with a wildcard indicating that the requests from all domains are allowed: Access-Control-Allow-Origin: *.For example in this case it should be: Access-Control-Allow-Origin: The requested data along with an Access-Control-Allow-Origin (ACAO) header in its response indicating the requests from the origin are allowed.The server at sends one of these three responses:.
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