Used when issuing a preflight request to let the server know which HTTP method will be used when the actual request is made. Used when issuing a preflight request to let the server know which HTTP headers will be used when the actual request is made. Indicates how long the results of a preflight request can be cached. Indicates which headers can be exposed as part of the response by listing their names.
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Specifies the methods allowed when accessing the resource in response to a preflight request. Used in response to a preflight request to indicate which HTTP headers can be used when making the actual request. Indicates whether the response to the request can be exposed when the credentials flag is true. Indicates whether the response can be shared.
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Varyĭetermines how to match request headers to decide whether a cached response can be used rather than requesting a fresh one from the origin server. This ensures the coherence of a new fragment of a specific range with previous ones, or to implement an optimistic concurrency control system when modifying existing documents. Makes the request conditional, and expects the resource to be transmitted only if it has not been modified after the given date.
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This is used to transmit data only when the cache is out of date. Makes the request conditional, and expects the resource to be transmitted only if it has been modified after the given date.
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This is used to update caches (for safe requests), or to prevent uploading a new resource when one already exists. Makes the request conditional, and applies the method only if the stored resource doesn't match any of the given ETags. Makes the request conditional, and applies the method only if the stored resource matches one of the given ETags. Conditional requests using If-Match and If-None-Match use this value to change the behavior of the request. ETagĪ unique string identifying the version of the resource. Conditional requests using If-Modified-Since and If-Unmodified-Since use this value to change the behavior of the request. It is less accurate than ETag, but easier to calculate in some environments. The last modification date of the resource, used to compare several versions of the same resource. Note that only hop-by-hop headers may be set using the Connection header. These headers are meaningful only for a single transport-level connection, and must not be retransmitted by proxies or cached. Intermediate proxies must retransmit these headers unmodified and caches must store them. These headers must be transmitted to the final recipient of the message: the server for a request, or the client for a response.
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HTTP headers let the client and the server pass additional information with an HTTP request or response.