![]() ![]() * – Users can specify the * as a wildcard. ![]() Syntax: Access-Control-Allow-Origin: * | | nullĪccess-Control-Allow-Origin accepts three types of directives mentioned above and discussed below: i.e., the will need to let the browser know that it is okay for the third-party server to access or fetch resources from the first origin. If a third party or the second origin here wants to get permission or access the first origin, i.e., and access their resources, the second origin. The browser will not allow any third party to access the resources from the and will block the request of that third party to protect the site's security the user is handling. Let a user has a first origin, "first_origin," i.e.,, and they want to receive resources from a second origin, "second_origin":. Let us discuss an example where Access-Control-Allow-Origin comes into action: It informs the browser what origins it should allow for receiving requests from the second origin. But among all the origins, the primary origin is the Access-Control-Allow-Origin. Some CORS headers let sharing the resources among the origins. How Access-Control-Allow-Origin works?īrowsers permit origins to transfer or share resources with the help of CORS (Cross-Origin Resource Sharing). The Access-Control-Allow-Origin header helps or allows cross-origin access possible by particular requesting origins. The page of the first site is not accessible to any other origin by default. A web browser checks the Access-Control-Allow-Origin with the requesting page's origin and allows the site access to the response if it finds both requests are the same. The Access-Control-Allow-Origin is a response header that users can use to demonstrate to a browser whether it can share the response with requesting code from a specific origin site. This article will discuss the working of the Access-Control-Allow-Origin, which informs the browser that a site's content is accessible to specific origins. Here, the term origin does not refer to only the hostname but the combination of hostname with port, and scheme, for example. In a browser, resource sharing is a technique to allow a site running at a first origin to request resources from the second origin. ![]() Access-Control-Allow-Origin is a CORS (Cross-Origin Resource Sharing) response header. ![]()
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