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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 for the request header. Its meaning in a response header is not specified. [77]
In computing, POST is a request method supported by HTTP used by the World Wide Web. By design, the POST request method requests that a web server accepts the data enclosed in the body of the request message, most likely for storing it. [1] It is often used when uploading a file or when submitting a completed web form.
Cocoa is Apple's native object-oriented application programming interface (API) for its desktop operating system macOS.. Cocoa consists of the Foundation Kit, Application Kit, and Core Data frameworks, as included by the Cocoa.h header file, and the libraries and frameworks included by those, such as the C standard library and the Objective-C runtime.
Legacy MIME types include text/json, text/x-json, and text/javascript. [27] The standard filename extension is .json. [28] JSON Schema specifies a JSON-based format to define the structure of JSON data for validation, documentation, and interaction control.
HTTP/3, the successor to HTTP/2, was published in 2022. [13] As of February 2024, it is now used on 30.9% of websites [14] and is supported by most web browsers, i.e. (at least partially) supported by 97% of users. [15] HTTP/3 uses QUIC instead of TCP for the underlying transport protocol. Like HTTP/2, it does not obsolete previous major ...
Custom header fields can be added to the request to indicate how the server should fulfill it, [12] and data can be uploaded to the server by providing it in the "send" call. [13] The response can be parsed from the JSON format into a readily usable JavaScript object, or processed gradually as it arrives rather than waiting for the entire text ...
[9] start_response is a callable itself, taking two positional parameters, status and response_headers. Line 2 calls start_response, specifying "200 OK" as the HTTP status and a "Content-Type" response header. Line 3 makes the function into a generator. The body of the response is returned as an iterable of byte strings.
The range header is used by HTTP clients to enable resuming of interrupted downloads, or split a download into multiple simultaneous streams. 207 Multi-Status (WebDAV; RFC 4918) The message body that follows is by default an XML message and can contain a number of separate response codes, depending on how many sub-requests were made. [7]