Also, if POST is used to send request data with a Content-Type other than application/x-if the POST request sends an XML payload to the server using application/xml or text/xml, then the request is preflighted. It uses methods other than GET, HEAD or POST.Since the original CORS request has a preflight request before it, we call the original CORS request preflighted.Īny CORS request has to be preflighted if: This preflight request itself is an OPTIONS request to the same URL. a preliminary probe) before sending the request being preflighted to ask the server permission if the original CORS request can proceed. A preflighted request is a CORS request where the browser is required to send a preflight request (i.e. Preflighted requestsĪ preflighted request is the other type of CORS request. The browser guarantees that the Origin request header is set reliably and accurately. IntentionĪs you can see, the server has control over whether to allow the request or not depending on the origin of the request. Only use * if your application absolutely requires it such as creating an open/public API. The check passes such as in this example if either the Access-Control-Allow-Origin matches the single origin exactly or contains the wildcard * operator.Ī server that responds Access-Control-Allow-Origin: * allows all origins which can be a large security risk.
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