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Protocol-relative links (PRL), also known as protocol-relative URLs (PRURL), are URLs that have no protocol specified. For example, //example.com will use the protocol of the current page, typically HTTP or HTTPS.
Absolute URLs are URLs that start with a scheme [5] (e.g., http:, https:, telnet:, mailto:) [6] and conform to scheme-specific syntax and semantics. For example, the HTTP scheme-specific syntax and semantics for HTTP URLs requires a "host" (web server address) and "absolute path", with optional components of "port" and "query".
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.
Some websites create short links to make sharing links via instant messaging easier, and to make it cheaper to send them via SMS. This can be done online, at the web pages of a URL shortening service; to do it in batch via bulk upload with tools like CSV importer or on demand may require the use of an API.
Caching Behavior: Many web browsers cache 301 redirects. This means that once a user's browser encounters a 301 redirect, subsequent requests to the original URL will be automatically directed to the new URL without contacting the server. Updating Bookmarks: Browsers may update bookmarks to reflect the new URL after encountering a 301 redirect.
A properly coded website would require a DELETE or POST method for this action, which non-malicious bots would not make. One example of this occurring in practice was during the short-lived Google Web Accelerator beta, which prefetched arbitrary URLs on the page a user was viewing, causing records to be automatically altered or deleted en masse.
TinyURL is a URL shortening web service, which provides short aliases for redirection of long URLs. Kevin Gilbertson, a web developer, launched the service in January 2002 [1] as a way to post links in newsgroup postings which frequently had long, cumbersome addresses. TinyURL was the first notable URL shortening service and is one of the ...
Therefore, URLs are a subset of URIs, ie. every URL is a URI (and not necessarily the other way around). [2] Other URIs provide only a unique name, without a means of locating or retrieving the resource or information about it; these are Uniform Resource Names (URNs). The web technologies that use URIs are not limited to web browsers.