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A Uniform Resource Identifier helps identify a source without ambiguity. Many URI schemes are registered with the IANA ; however, there exist many unofficial URI schemes as well. Mobile deep links are one example of a class of unofficial URI schemes that allow for linking directly to a specific location in a mobile app.
Because protocol relative is relative to the site where the URL is linked from, all protocol relative URLs on Wikipedia will render as HTTPS. This means protocol relative links should no longer be used on Wikipedia, and existing protocol relative links should be converted to either the HTTP or HTTPS scheme .
URL is a useful but informal concept: a URL is a type of URI that identifies a resource via a representation of its primary access mechanism (e.g., its network "location"), rather than by some other attributes it may have. [19] As such, a URL is simply a URI that happens to point to a resource over a network.
An Internationalized Resource Identifier (IRI) is a form of URL that includes Unicode characters. All modern browsers support IRIs. The parts of the URL requiring special treatment for different alphabets are the domain name and path. [18] [19] The domain name in the IRI is known as an Internationalized Domain Name (IDN).
A URL will often comprise a path, script name, and query string.The query string parameters dictate the content to show on the page, and frequently include information opaque or irrelevant to users—such as internal numeric identifiers for values in a database, illegibly encoded data, session IDs, implementation details, and so on.
If a web server responds with Cache-Control: no-cache then a web browser or other caching system (intermediate proxies) must not use the response to satisfy subsequent requests without first checking with the originating server (this process is called validation). This header field is part of HTTP version 1.1, and is ignored by some caches and ...
The following normalizations are described in RFC 3986 [1] to result in equivalent URIs: . Converting percent-encoded triplets to uppercase. The hexadecimal digits within a percent-encoding triplet of the URI (e.g., %3a versus %3A) are case-insensitive and therefore should be normalized to use uppercase letters for the digits A-F. [2] Example:
A user might mistype a URL. Organizations often register these misspelled domains and redirect them to the intended location. This technique is often used to "reserve" other top-level domains (TLD) with the same name, or make it easier for a ".edu" or ".net" site to accommodate users who type ".com".