This article is meant to be a reference piece.
Holds the Access-Control-Max-Age header value. To be clear, the method and header fields are mutually exclusive. When one of them is empty the other is non-empty.
The primary key of an entry consists of all fields excluding the max-age field. Entries must be removed when the time specified in the max-age field has passed since storing the entry. Entries can also be added and removed per the algorithms below. They are added and removed in such a way that there can never be duplicate items in the cache.
User agents may clear cache entries before the time specified in the max-age field has passed. Although this effectively makes the preflight result cache optional, user agents are strongly encouraged to support it.
Whenever the make a request steps are applied, fetch the request URL from origin source origin using referrer source as override referrer source with the manual redirect flag set, and the block cookies flag set if the omit credentials flag is set. Use method request methodentity body request entity bodyincluding the author request headersand include user credentials if the omit credentials flag is unset.
Whenever the are applied, follow this set of steps: If the resource sharing check for the current resource returns fail, apply the network error steps.
If the request URL origin is not same origin with the original URL originset source origin to a globally unique identifier becomes "null" when transmitted.
Transparently follow the redirect while observing the set of request rules. Whenever the abort steps are applied, terminate the algorithm that invoked this set of steps and set the cross-origin request status to abort error. Whenever the network error steps are applied, terminate the algorithm that invoked this set of steps and set the cross-origin request status to network error.
This has no effect on setting of user credentials. Whenever the cache and network error steps are applied, follow these steps: Apply the network error steps acting as if the algorithm that invoked the cache and network error steps invoked the network error steps instead.
There is a cache match when there is a cache entry in the preflight result cache for which the following is true: The url field value is a case-sensitive match for request URL. The credentials field value is true and the omit credentials flag is unset, or it is false and the omit credentials flag is set.
There is a method cache match when there is a cache entry for which there is a cache match and the method field value is a case-sensitive match for the given method. There is a header cache match when there is a cache entry for which there is a cache match and the header field value is an ASCII case-insensitive match for the given header field name.
If the response includes zero or more than one Access-Control-Allow-Origin header values, return fail and terminate this algorithm. If the value of Access-Control-Allow-Origin is not a case-sensitive match for the value of the Origin header as defined by its specification, return fail and terminate this algorithm.
If the omit credentials flag is unset and the response includes zero or more than one Access-Control-Allow-Credentials header values, return fail and terminate this algorithm.
If the omit credentials flag is unset and the Access-Control-Allow-Credentials header value is not a case-sensitive match for "true", return fail and terminate this algorithm. At various places user agents are allowed to take additional precautions.Get Instant Access to eBook Army Letter Of Recommendation Example PDF at Our Huge Library.
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