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To locate any arbitrary object on the Internet, you need to find out the following information: 1 First, you need to locate and access the machine on the network on which the object resides Locating the site might be a matter of specifying its domain name or IP address, whereas accessing the machine might require a username and password 2 After you access the machine, you need to determine the name of the desired file, where the file is located, the position in the file as specified by a fragment identifier, and what protocol will be used to retrieve the information or access the object In other words, a URL describes where something is and how it will be retrieved The where is specified by the machine name, the directory name, the filename, and potentially more
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Some people call URLs universal resource locators Except for a historical reference to universal resource locators in documentation from many years ago, the current standard wording is uniform resource locator
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The how is specified by the protocol (for example, HTTP) Slashes and other characters are used to separate the parts of the address into machine-readable pieces The basic structure of the URL is shown here:
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protocol://site address/directory/filename#fragmentid
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The next several sections look at the individual pieces of a URL in closer detail
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A document exists on some serving computer somewhere on the global Internet or within a private intranet The first step in finding a document is to identify its server This may be performed by a site s IP address,
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http://10001
though it is more likely that an alphanumeric domain name is employed,
http://wwwhtmlrefcom
The name may be fully qualified with a machine name, a domain, an organization type, and potentially, a country code For example,
http://wwwhtmlrefcom
would specify the name of a machine called www in the domain htmlref, which is in the top-level COM domain By contrast,
http://devhtmlrefcom
would reference a machine known as dev in the same domain Very often for primary Web sites within a domain the machine name is omitted, so we simply write
http://htmlrefcom
However, such configuration is up to the owner of the domain This short-hand form should be employed as most sites are reachable without a www prefix Historically, top-level domains such as those found in Table D-1 are used
TABLE D-1 Common Top-Level Domains
Domain com net edu org gov mil
Intended Type Commercial entities Networks Educational institutions Non-Profit organizations Government entities US military
Appendix D:
URLs
However, starting around 2001, the top-level domain space expanded quite a bit A sample of the top-level domains that have been added beyond the commonly known ones is shown in Table D-2 Potentially more domains may be found at the Internet Assigned Numbers Authority (IANA) Web site (ianaorg) At the time of this edition s writing in 2009, there is a distinct possibility that arbitrary domains could be introduced For example, google might be top-level domain for all Google properties Even without this happening, the top-level domain space is clearly a mess, and with generic domains on the horizon, the situation seems unlikely to get much better soon Geographic domains are particularly common outside the United States; such a domain name typically contains more information than the organization type, with a fully qualified domain name (FQDN) including a country code as well It generally is written as follows:
machine namedomain namedomain typecountry code
Zone identifiers outside the US use a two-character code to indicate the country hosting the server These include ca for Canada, mx for Mexico, jp for Japan, and so on A few examples are shown here
wwwunamedumx wwwmcgillca wwwbbccouk wwwoxacuk wwwsonycojp
PART III
A complete list of country codes can be found at the IANA site (ianaorg)
Domain aero asia biz cat coop info jobs mobi museum name pro tel travel TABLE D-2
Intended Type Business entities similar to com Entities in the Asia Pacific region Business entities (similar to com) Catalan linguistic and cultural community-related sites Cooperatives Information-oriented sites Job hosting sites Mobile device sites Museums and similar institutions Individual by names Professionals, particularly certified accountants, engineers, lawyers, and physicians Telephone and contact information Travel and tourism related sites
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