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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 ...
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, a space must be replaced by %20. To encode the URL, replace the following characters with: To encode the URL, replace the following characters with: Character
The URI generic syntax uses URL encoding to deal with this problem, while HTML forms make some additional substitutions rather than applying percent encoding for all such characters. SPACE is encoded as '+' or "%20". [11] HTML 5 specifies the following transformation for submitting HTML forms with the "GET" method to a web server. The following ...
Other octets must be percent-encoded. If the data is Base64-encoded, then the data part may contain only valid Base64 characters. [ 7 ] Note that Base64-encoded data: URIs use the standard Base64 character set (with ' + ' and ' / ' as characters 62 and 63) rather than the so-called " URL-safe Base64 " character set.
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:
As of HTML5 the recommended charset is UTF-8. [3] 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
Double URI-encoding, also referred to as double percent-encoding, is a special type of double encoding in which data is URI-encoded twice in a row. [6] In other words, double-URI-encoded form of data X is URI-encode(URI-encode(X)). [7]