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URL encoding, officially known as percent-encoding, is a method to encode arbitrary data in a uniform resource identifier (URI) using only the US-ASCII characters legal within a URI. Although it is known as URL encoding , it is also used more generally within the main Uniform Resource Identifier (URI) set, which includes both Uniform Resource ...
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:
Percent-encoding of reserved characters in URLs and query strings can significantly increase their length, and while Apache HTTP Server can handle up to 4,000 characters in a URL, [5] Microsoft Internet Explorer is limited to 2,048 characters in any URL. [6]
URLs containing certain characters will display and link incorrectly unless those characters are percent-encoded. For example, a space must be replaced by %20 (this can be done using the PATH option of the {{urlencode:}} parser function).
For example, this is the source of the special handling of plus sign, '+' within browser URL percent encoding (which today, with the deprecation of indexed search, is all but redundant with %20). Also some web servers supporting CGI (e.g., Apache ) will process the query string into command line arguments if it does not contain an equals sign ...
A uniform resource locator (URL), colloquially known as an address on the Web, [1] is a reference to a resource that specifies its location on a computer network and a mechanism for retrieving it. A URL is a specific type of Uniform Resource Identifier (URI), [ 2 ] [ 3 ] although many people use the two terms interchangeably.
A URI Template is a way to specify a URI that includes parameters that must be substituted before the URI is resolved. It was standardized by RFC 6570 in March 2012.. The syntax is usually to enclose the parameter in Braces ({example}).
An "encoding sniffing algorithm" is defined in the specification to determine the character encoding of the document based on multiple sources of input, including: Explicit user instruction; An explicit meta tag within the first 1024 bytes of the document; A byte order mark (BOM) within the first three bytes of the document