If you'd like to contribute to the data, please check out and send us a pull request. The compatibility table in this page is generated from structured data. The definition of 'Access-Control-Allow-Origin' in that specification. ![]() Vary: Origin Specifications Specification If the server specifies an origin host rather than " *", then it must also include Origin in the Vary response header to indicate to clients that server responses will differ based on the value of the Origin request header. ![]() I thought of something like this: A client downloads JavaScript code M圜ode.js from - the origin. To allow to access your resource, you can specify: Access-Control-Allow-Origin: CORS and caching How does the 'Access-Control-Allow-Origin' header work Ask Question Asked 11 years, 8 months ago Modified 30 days ago Viewed 2.5m times 1571 Apparently, I have completely misunderstood its semantics. To allow any resource to access your resource, you can specify: Access-Control-Allow-Origin: * Specifies a URI that may access the resource. If you don’t control the server your frontend code is sending a request to, and the problem with the response from that server is just the lack of the necessary Access-Control-Allow-Origin header, you can still get things to workby making the request through a CORS proxy. Header typeĭirectives * For requests without credentials, the server may specify "*" as a wildcard, thereby allowing any origin to access the resource. How to use a CORS proxy to avoid No Access-Control-Allow-Origin header problems. ![]() The Access-Control-Allow-Origin response header indicates whether the response can be shared with resources with the given origin.
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