![]() The Origin request header is always sent by the browser in a CORS request and indicates the origin of the request. Based on the result of the OPTIONS request, the browser decides whether the request is allowed or not. The pre-flight request checks the methods and headers allowed by the server, and if credentials are permitted. ![]() The W3C CORS specification mandates that for non simple requests, such as requests other than GET or POST or requests that uses credentials, a pre-flight OPTIONS request must be sent in advance to check if the type of request will have a bad impact on the data. ![]() HTTP headers are used to accomplish this. CORS defines the protocol to use between a web browser and a server to determine whether a cross-origin request is allowed. In the past, the XHR L1 API only allowed requests to be sent within the same origin as it was restricted by the Same Origin Policy (SOP).Ĭross-origin requests have an Origin header that identifies the domain initiating the request and is always sent to the server. Home > Latest > 4-Web Application Security Testing > 11-Client-side Testing Testing Cross Origin Resource Sharing IDĬross Origin Resource Sharing (CORS) is a mechanism that enables a web browser to perform cross-domain requests using the XMLHttpRequest (XHR) Level 2 (L2) API in a controlled manner.
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