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URL (Uniform Resource Locator), the URL is a "uniform resource locator", a standardized way of registering addresses on the Internet. Each URL is unique and indicates the location of a page on the web .
Url
An IP address or a corresponding domain name makes it
possible to uniquely identify a computer on the Internet, but the fact is that
there can be a lot of different information on a computer in various formats,
for example, in the form of files, electronic messages, pages, etc. . In order
to accurately receive the necessary information and in the required format, a
string of characters is used , which is called a universal resource locator or
URL (Uniform Resource Locator). This line uniquely identifies any resource on
the Internet. It is a line that is displayed in the Address field of Internet
Explorer when browsing the Internet.
URL format
Address pointers have a traditional notation:
<protocol>: // <site type>. <domain name>:
<port> / <URL path> /
For example: http: // www. example.com: 8080 / somepath.php
/
• Protocol
. Determines the type of data transfer: http - plain text, https - text
transmission over a secure connection, ftp - file transfer protocol, mailto -
email address.
• Site type
. Determine which browser the site is adapted for. In accordance with
previously accepted standards, all URLs will start with www characters, which
will identify the site as an accessible resource on the Internet using a normal
web browser (e.g. for mobile phones , later provided for the abbreviation wap -
Protocol provided wireless application). At the moment, this rule is used much
less frequently, and if the site name is not specified in front of the site
name, this site is considered to be for a simple web browser. If the resource
is adapted for viewing from a mobile device or has both versions, the wap and
www extensions are indicated.
• A domain
name . Unique symbolic address of a resource on the network.
• Port .
Number of access ports. Any network application has its own data exchange
protocols that are connected to specific ports. The HTTP protocol works on
ports 80 or 8080. If only web pages are available on the requested server, the
port is not specified by default. If the resource can be accessed, for example
the ftp service as well, you must specify the port number.
• URL path
. Indicates the exact location of the page on the server.
URL entry form
Initially, only a limited set of characters could be used in
the URL: Latin alphabet letters, numbers, and some punctuation marks. At the
moment, locators can display and recognize the characters of many other
alphabets: Arabic, Slavic, Chinese characters, etc. This feature was achieved
thanks to the advent of transcoding functions , the most popular of which are:
• Convert
each Cyrillic character to Unicode (UTF-8) format and further convert it to
hexadecimal representation. Therefore, it became possible to create URL of the
form http://example.com/Example (called CNC), which in the original
representation will look like this: http://example.com/%BA%D1%80%D0 % BE% D0%
BA% D1% 80% D0% B5% D0% B4%.
• PunnyCode
technology . This URL conversion method allows you to convert Cyrillic to Latin
characters for the correct display of IDN domain names. For example, an encoded
URL of the form http://xn--e1afmkfd.com in converted format will mean
http://example.com.
URL services
Among the shortcomings of the URL , you can often note the
great confusion, length and notorious lack of flexibility: web pages can be
changed or removed, while the URL continues to point to an already non-existent
address.
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