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The Cache-Control: no-cache HTTP/1.1 header field is also intended for use in requests made by the client. It is a means for the browser to tell the server and any intermediate caches that it wants a fresh version of the resource. The Pragma: no-cache header field, defined in the HTTP/1.0 spec, has the same purpose. It, however, is only defined ...
Cross-origin resource sharing (CORS) is a mechanism to safely bypass the same-origin policy, that is, it allows a web page to access restricted resources from a server on a domain different than the domain that served the web page.
Edge: Stable build (79) December 2019 87 April 2020 Edge 79 was the first version based on Chromium Firefox: Stable build (72.0.1) January 2020 88 [10] April 2021 [26] Safari: Stable build (14.0) September 2020 16.4 March 2023 Apple is testing HTTP/3 support on some Safari users starting with Safari 16.4. [27]
The following header names are in use as part of experimental CSP implementations: [3] Content-Security-Policy – standard header name proposed by the W3C document. Google Chrome supports this as of version 25. [7] Firefox supports this as of version 23, [8] released on 6 August 2013. [9] WebKit supports this as of version 528 (nightly build ...
A server implements an HSTS policy by supplying a header over an HTTPS connection (HSTS headers over HTTP are ignored). [1] For example, a server could send a header such that future requests to the domain for the next year (max-age is specified in seconds; 31,536,000 is equal to one non-leap year) use only HTTPS: Strict-Transport-Security: max-age=31536000.
In HTTP, "Referer" (a misspelling of "Referrer" [1]) is an optional HTTP header field that identifies the address of the web page (i.e., the URI or IRI) from which the resource has been requested. By checking the referrer, the server providing the new web page can see where the request originated.
HTTP/2 (originally named HTTP/2.0) is a major revision of the HTTP network protocol used by the World Wide Web.It was derived from the earlier experimental SPDY protocol, originally developed by Google.
Sending a large request body to a server after a request has been rejected for inappropriate headers would be inefficient. To have a server check the request's headers, a client must send Expect: 100-continue as a header in its initial request and receive a 100 Continue status code in response before sending the body. If the client receives an ...