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A server uses "Alt-Svc" header (meaning Alternative Services) to indicate that its resources can also be accessed at a different network location (host or port) or using a different protocol When using HTTP/2, servers should instead send an ALTSVC frame. [50] Alt-Svc: http/1.1="http2.example.com:8001"; ma=7200: Permanent Cache-Control
The HTTP Location header field is returned in responses from an HTTP server under two circumstances: To ask a web browser to load a different web page (URL redirection). In this circumstance, the Location header should be sent with an HTTP status code of 3xx. It is passed as part of the response by a web server when the requested URI has:
A query string is a part of a uniform resource locator that assigns values to specified parameters.A query string commonly includes fields added to a base URL by a Web browser or other client application, for example as part of an HTML document, choosing the appearance of a page, or jumping to positions in multimedia content.
Request line, such as GET /logo.gif HTTP/1.1 or Status line, such as HTTP/1.1 200 OK, Headers; An empty line; Optional HTTP message body data; The request/status line and headers must all end with <CR><LF> (that is, a carriage return followed by a line feed). The empty line must consist of only <CR><LF> and no other whitespace.
This is a format for encoding key-value pairs with possibly duplicate keys. Each key-value pair is separated by an '&' character, and each key is separated from its value by an '=' character. Keys and values are both escaped by replacing spaces with the '+' character and then using percent-encoding on all other non-alphanumeric [9] characters.
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 ...
ETag values can be used in Web page monitoring systems. Efficient Web page monitoring is hindered by the fact that most websites do not set the ETag headers for Web pages. When a Web monitor has no hints whether Web content has been changed, all content has to be retrieved and analyzed using computing resources for both the publisher and ...
This template fetches a parameter value from a template call on a specified page: {{Get parameter | x | y | z}} gets parameter x from the call of template y on page z.It's an alternate implementation of {{Template parameter value}}, which while it doesn't work (and will likely produce garbage) if the page the parameter value is being fetched from contains more than a call to the template ...