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| | Uniform Resource Locator Summary |
 | | A Uniform Resource Locator (URL) is a string of characters conforming to a standardized format, which refers to a resource on the Internet (such as a document or an image) by its location. |
 | | A URL is classified by its scheme, which typically indicates the network protocol used to retrieve a representation of the identified resource over a computer network. |
 | | Some of the first URL schemes, such as the still-popular "mailto", "http", "ftp", and "file" schemes, along with the general syntax of URLs, were first detailed in 1994 in Request for Comments RFC 1630, superseded within a year by the more refined RFC 1738 and RFC 1808. |
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