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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 ...
A URI that links to a JSON document can specify a pointer to a specific value. [22] For example, a URL ending in #/foo could be used to extract the value from a key-value pair in a document beginning with { "foo": ["bar", "baz"], ... } In URIs for MIME application/pdf documents PDF viewers recognize a number of fragment identifiers.
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.
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. Examples of data URIs showing most of the features are:
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.
Firefox also suffered a similar security issue (by combining view-source and JavaScript URIs [5]), but still supported it in Firefox 1.5 [6] after being fixed. In 2009, a new discovered bug was fixed in Firefox 3.0.9 .
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.
A few fields can contain comments (i.e. in User-Agent, Server, Via fields), which can be ignored by software. [8] Many field values may contain a quality (q) key-value pair separated by equals sign, specifying a weight to use in content negotiation. [9]