Uniform Resource Locator (URL)
Uniform Resource Locator (URL)
A Uniform Resource Locator (URL) serves as the designated address for a specific resource on the internet. Each valid URL ideally corresponds to a distinct resource, such as an HTML page, a CSS document, or an image. However, in reality, there are exceptions to this rule, often involving URLs that point to non-existent or relocated resources. The responsibility for managing both the resource indicated by the URL and the URL itself lies with the owner of the web server.
A URL consists of various components, with certain parts being mandatory and others being optional. The following URL highlights the most crucial elements (further explanations are provided in subsequent sections):
Every URL contains the following information:
- The scheme name or protocol.
- A colon, two slashes.
- A host, normally called a domain name but sometimes as a literal IP address.
- A colon followed by a port number.
- Full path of the resource.
URL protocols encompass HTTP (Hypertext Transfer Protocol) and HTTPS (HTTP Secure) for web resources, "mail to" for email addresses, FTP for files on a File Transfer Protocol (FTP) server, and telnet for remote computer access sessions. While most URL protocols are accompanied by a colon and two forward slashes, "mail to" is preceded solely by a colon.
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