| How the Web WorksBecause you're taking
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| | you, the user, don't know the difference.
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| this course and reading this lesson, it's
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| | A Web page is a Web page, no matter what
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| a pretty safe assumption that you can get
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| | kind of computer it lives on.A different
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| on the Web and move around with certain
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| | kind of computers does not usually play
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| adeptness. To access any given web pages,
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| | well together and you know that most of
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| we are most likely to use its web address
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| | the time it takes a bit of jumping
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| which is technically called a URL
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| | through hoops to make them communicate.
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| (Uniform Resource Locator) and click on
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| | So why is it that the Web -- which is
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| hyperlinks and graphics to move from one
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| | made up of all kinds of computers --
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| page to another. In general, the Web is a
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| | works so seamlessly? It's simple, really.
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| pretty seamless world; you often move
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| | All of the clients and servers on the Web
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| from one Web site to another and may not
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| | speak a common language called the HTTP
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| know you have done so. If you want to add
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| | protocol.Common GroundA protocol is a set
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| your Web page -- and eventually your Web
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| | of rules two computers use to communicate
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| site -- to this virtually seamless
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| | with one another. A protocol called HTTP
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| environment, you'll need to understand a
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| | (Hypertext Transfer Protocol) is spoken
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| bit about the workings behind the Web
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| | by both the Web browser and Web servers
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| scenes.Of Clients and Servers
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| | that carefully defines how Web pages are
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| Simply put, the Web is a gigantic
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| | requested and received. It doesn't really
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| network. What that means in geek-speak is
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| | matter which operating system is running
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| that there are, in the most general
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| | for as long as both the browser and the
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| terms, two roles that a computer can play
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| | server speak HTTP. The HTTP protocol is
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| on the Web: client or server. Anything
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| | the common ground that allows them to
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| else deliverable over the Web including
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| | communicate.Different computers just
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| documents, images, sound files is stored
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| | could not work with each other and so
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| by the server and clients access those
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| | without protocols, the web would not work
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| files. Occasionally, a computer can play
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| | at all. Although HTTP is the protocol for
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| both roles, but more often than not, a
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| | requesting and sending Web, there are
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| computer is one or the other.For example,
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| | other protocols as well at work on the
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| when you type the URL into your Web
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| | Internet besides HTTP.Putting It All
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| browser, your client is sending a request
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| | TogetherThe HTTP protocol is written in
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| to the Yahoo Web server -- ( identified
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| | HTML (Hypertext Markup Language) to
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| as for a Web page called home.html. When
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| | request and send the actual web pages
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| the Web server receives your request for
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| | that clients and servers uses.A Large
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| home.html, it looks to see if the Web
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| | amount of data can be stored on the
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| page exists, and if it does, the server
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| | server and the same serves if to hundreds
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| sends a copy to you so that you can view
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| | of clients, often at the same time. A
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| it in your browser. An error message is
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| | collection of web servers is actually
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| received to let you know that the page
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| | what is used to respond to client request
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| you wanted could not be found whenever
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| | by web sites like Yahoo and Microsoft as
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| the page does not exist on the server.
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| | they receive hundreds of thousands of
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| Web Clients and could Web Servers
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| | hits everyday. It is not mandatory for
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| communicate with one another through a
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| | the Web server to run the same kind of
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| system of requests and responses.The Web
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| | operating system which the Web clients is
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| would not work without clients and
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| | using whenever the Web pages are being
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| servers. The clients could access each of
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| | requested. Protocols fill the
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| the web documents stored on the servers
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| | communications gap between different
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| all over the world regardless of where
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| | kinds of computers and allow them to
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| the client or server is actually located.
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| | exchange Web pages simultaneously.What
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| This means you can request pages from
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| | This Means To YouYou may be wondering why
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| servers in Sydney, Australia, and Van
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| | you should care about what goes on behind
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| Horn, Texas in the exact same way and
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| | the scenes of the Web. In fact the web is
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| receive responses from each server in the
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| | designed in such a way that you don't
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| exact same way. In the end, Web surfing
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| | need to care as a web surfer. To find a
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| is nothing more than a Web client --
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| | place to serve your web pages needs to be
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| a.k.a. A series of web pages are being
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| | found by you as a web developer -- a Web
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| requested from the Web servers located
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| | server of some kind -- so that your users
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| all around by the Web Browser.How
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| | can request your pages using their Web
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| Protocols Help Computers CommunicateAll
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| | browsers. Your Web pages can't be seen by
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| kinds of operating systems -- PCs, Macs
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| | the world unless they reside on a Web
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| and Unix to name just three -- is running
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| | server that is hooked up to the Internet.
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| all across the world and both clients and
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| | Anyone with a Web client could access
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| servers can be any kind of computer
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| | your web pages, once your pages are made
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| running any kind of operating system. You
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| | available to a connected server(remember,
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| could be using a computer which is
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| | that's a fancy name for a browser). For
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| running on windows to serve you with a
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| | now, that's all you need to know about
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| website and likewise one may surf the web
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| | Web clients and servers. In a later
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| with a Macintosh client. A Unix computer
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| | lesson you'll learn more about finding a
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| running Linux may serve the next Web page
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| | Web server home for your documents.
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| you view. The beauty of it all is that
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