Header indicates how long the response can be cached, so that for Have the following headers specified: Access-Control-Allow-Origin: Īccess-Control-Allow-Methods: PUT, DELETE The response to the preflight request could That uses the desired method ( DELETE in this example) and OPTIONS method and then needs to handle the actual request The author needs to reply to a preflight request that uses the It gets slightly more complicated if the resource author wants to beĪble to handle cross-origin requests using methods other than Introduced by this specification could look as follows: Access-Control-Allow-Origin: Ĭlient.onreadystatechange = function() If a resource author has a simple text resource residing atīe able to access it, the response combined with a header More background information about this document. Examples are Server-Sent Events and XMLHttpRequest. So-called CORS API specifications, which define how this specification is This specification is a building block for other specifications, returning nothing) on the cross-origin requests that This extension enables server-side applications to enforce Was deemed a cross-origin request by the user agent, through the Server-side applications are enabled to discover that an HTTP request This is again validated by the user agent. User agents can discover via a preflight request whetherĪ cross-origin resource is prepared to accept requests, using a The user agent validates that the value and origin of where the Value, to allow access to the resource's contents. Header, with the origin of where the request originated from as the This specification extends this model in several ways: Include user credentials with cross-origin requests, including HTTP In user agents that follow this pattern, network requests typically Toward destinations that differ from the running application's origin. Running from one origin from obtaining data retrieved from another origin,Īnd also limit unsafe HTTP requests that can be automatically launched These restrictions prevent a client-side Web application User agents commonly apply same-origin restrictions to network 8.2 Dealing with Same Origin to Cross-Origin Redirects.8.1 Constructing a Cross-Origin Request.7.1.7 Generic Cross-Origin Request Algorithms.7.1.5 Cross-Origin Request with Preflight.7.1.1 Handling a Response to a Cross-Origin Request.6.1 Simple Cross-Origin Request, Actual Request, and.5.9 Access-Control-Request-Headers Request Header.5.8 Access-Control-Request-Method Request Header.5.6 Access-Control-Allow-Headers Response Header.5.5 Access-Control-Allow-Methods Response Header.5.4 Access-Control-Max-Age Response Header. ![]() 5.3 Access-Control-Expose-Headers Response Header.5.2 Access-Control-Allow-Credentials Response Header.5.1 Access-Control-Allow-Origin Response Header.An individual who has actual knowledge of a patent which the individual believes contains Essential Claim(s) must disclose the information in accordance with section 6 of the W3C Patent Policy. W3C maintains a public list of any patent disclosures for the WebAppSec WG and the WebApps WG made in connection with the deliverables of the group that page also includes instructions for disclosing a patent. This document was produced by groups operating under the 5 February 2004 W3C Patent Policy. Implementations, but is not recommended for future implementation. It retains licensing commitments and remains available as a reference for old - and possibly still deployed. A newer specification exists that is recommended for new adoption in place of this specification.įor purposes of the W3C Patent Policy, this Superseded Recommendation has the same status as an active Recommendation A list ofĬurrent W3C publications and the latest revision of this technical reportĪs anticipated by the Memorandum of Understanding Between W3C and WHATWG, this specification is a Superseded Recommendation. Other documents may supersede this document. This section describes the status of this document at the time of ![]() Header), which would allow that resource to be fetched cross-origin from Mechanism described by this specification (e.g., specifyingĪccess-Control-Allow-Origin: as response To resources can use the algorithms defined by this specification. Specifications that enable an API to make cross-origin requests ![]() This document defines a mechanism to enable client-side cross-origin
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