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Uniform Resource Locators
Uniform Resource Locators (URL
s) are strings that specify how to access network resources, such as HTML
documents. They are part of the more general class of Universal Resource Identifiers (URIs). The most important use of URL
s is in HTML
documents to identify the targets of hyperlinks. When using a Web browser such as Netscape, every highlighted region has a URL
associated with it, which is accessed when the link is activated by a mouse click. Relative URLs
specify only a portion of the full URL
- the missing information is inferred though the context of the source document.
URLs are documented in RFC 1738. Relative URLs are documented in RFC 1808. URIs are documented in RFC 1630.
Here is a URL
that describes the root page of the Internet Encyclopedia:
The meaning of these fields is as follows:
The HyperText Transfer Protocol (HTTP) is to be used to retrieve the document. Other possible values for this field include https (use secure HTTP), ftp (use the File Transfer Protocol), and gopher (use the Gopher Protocol), among others.
This is a hostname to be resolved using the Domain Name Service
A directory and filename, to be passed along in the HTTP request to identify the document among many other on the server.