| If you have been using the internet for a
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| | phone can work, is that at the other end
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| while, you have probably typed into your
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| | of the line is your ISP's computer. This
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| browser something that starts with
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| | computer, and all the other computers on
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| "http:" and ends with ".html", hit "Go",
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| | the internet, have layers written by
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| watched your modem lights flicker on and
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| | programmers and designed by computer
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| off, and a couple of seconds later you
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| | architects, that follow strict and
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| are magically looking at page of todays
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| | detailed specifications of what to do
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| news or a page of pictures. Let's try and
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| | with the numbers coming out of your
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| take some of the magic away ...I thought
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| | computer.This sounds complex (and the
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| about calling this article a "Geeks view
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| | details are!), but it is just the same as
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| of HTTP"; I am not going into the nitty
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| | the person on Rock n Roll knowing to wait
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| gritty, but rather present a sketch of
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| | until they heard "over and out" before
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| how a geek might see something like HTTP,
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| | calling Jazz, and saying "over" at the
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| how they can think something like HTTP is
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| | end of each sentence. If no one followed
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| simple, and why they are not trying to
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| | these protocols the channel would have
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| make things complicated just for the sake
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| | been chaos, everyone trying to talk over
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| of it!--* Layers *--The background to the
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| | everyone else. In the same way, if your
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| sketch is that computers are full of
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| | computer and the other computers on the
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| layers. Programmers and designers think
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| | internet did not follow the
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| in layers, because organizing in layers
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| | specifications, the fact that your
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| makes it easier to build things.You don't
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| | computer sends out some numbers over your
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| need to know what or where the layers are
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| | phone line would be as useless as it
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| in your computer, or where one starts and
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| | sounds in the first place! ... but, if
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| another stops, but it is helpful to
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| | the rules are followed, it works.I am not
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| remember that they are everywhere because
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| | going to go into the actual details of
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| that is how geeks organize things.--*
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| | these specifications, but you have
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| Specifications and Protocols
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| | probably seen the acronyms; TCP/IP and
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| *--Specifications and Protocols are the
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| | DNS (and a heap more!)--* HTTP *--Lets
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| things that are the mostly likely cause
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| | say that someone on Rock n Roll knows
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| of all your computer frustrations ... but
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| | there is a football almanac onboard Jazz
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| they are a necessary evil. A wise man
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| | which will confirm the score of a
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| once said that any specification longer
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| | particular game and settle an argument
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| than one line will have ambiguities and
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| | onboard Rock n Roll. When Rock n Roll
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| be a source of problems. There are lots
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| | hears Jazz say "this is Jazz, go ahead,
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| of specifications and protocols in
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| | over" they know they have a connection to
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| everyday life. An example of a protocol
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| | Jazz and can start a conversation. Rock n
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| is when you are driving and see a red
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| | Roll might say "Jazz can you get me the
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| light you slow down and stop until it
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| | score of the 1987 Superbowl, over", and
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| turns green. The specification of this
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| | Jazz comes back with the answer finishing
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| protocol is the rule that is (probably)
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| | with an "over". Rock n Roll might ask for
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| written down in the road-rule book. But
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| | another score, or might ask for the list
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| we don't need to read the road rules, it
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| | of players, or might just say "thanks,
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| is just common sense to know to stop for
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| | over" and which point Jazz would say,
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| a red light. Of course we all know the
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| | "See ya, over and out".--* *--That is
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| words computers and common sense don't
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| | really what HTTP is doing. The connection
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| belong in the same sentence, and that is
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| | has been made at lower separate layers
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| why there are so many computer
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| | which are handling the numbers traveling
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| specifications and they are generally so
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| | out of your computer and moving them to
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| long and detailed.A common sentiment is
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| | the computer you are connecting to. HTTP
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| "you really need to spell things out for
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| | is a fairly simple specification that
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| a computer". I think this is a bit
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| | allows one computer to ask another for
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| misleading. It isn't the computer that
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| | some information (by naming it), and for
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| needs things spelt out, it is the
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| | that information to be returned. It
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| programmers and designers who build the
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| | doesn't say anything about where that
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| higher layers who need to spell things
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| | information comes from; as far as the
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| out for other programmers creating other
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| | HTTP specification is concerned, somebody
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| higher layers.If one programmer ignores
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| | could be sitting at the other computer
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| the rules of a specification, or doesn't
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| | typing in the response. However, usually
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| know there is a rule to follow, the
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| | the information that is asked for is the
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| result can be the same as if a driver
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| | name of a file, which is a bunch of
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| runs a red light ... a crash.--*
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| | numbers on the hard drive. Those numbers
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| Connection *--I have finished with the
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| | get moved from the hard drive into memory
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| background of the sketch, and now I am
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| | into the modem and back to your
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| going to draw a picture of a couple of
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| | computer.Thats it! That is the essence of
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| boats in a bay, each with a two- way
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| | HTTP.The point is, to see why a geek can
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| radio. I grew up around boats and always
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| | think something like HTTP is simple you
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| liked listening into the chatter on the
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| | need to think in layers like a geek.
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| two-way radios. The following
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| | Thinking in layers is not some kind of
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| conversations are from my memories of
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| | zen like discipline for them, they
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| growing up, but the ideas are probably
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| | probably do it without even being aware
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| the same for cb and other forms of
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| | of it as that is what their tools and
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| radio.The first boat we will call "Rock n
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| | languages encourage. If a programmer was
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| Roll" the second "Jazz". There was only
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| | writing an HTTP program they may write
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| one channel, and I noticed that there was
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| | something like:LowerLayer connectTo:
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| a protocol that everyone seemed to follow
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| | "Jazz".LowerLayer send: "GET
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| (except on Sunday afternoons) to keep
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| | SuperbowlScore1987".LowerLayer out.The
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| things orderly. I don't know if this
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| | programmer who writes this is not
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| protocol was written down anywhere as a
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| | thinking about the details of how the
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| set of specification rules or was just
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| | connection is established or how the
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| common sense. If Jazz wanted to call Rock
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| | message is sent. They may have no idea!
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| n Roll they would wait until they heard
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| | When they are working with HTTP they just
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| the current conversation end with an
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| | assume the lower layer works. If they, or
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| "Over and Out". They would wait a couple
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| | you, do want to understand the lower
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| of seconds and then say something like
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| | layer, then put HTTP out of your mind and
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| "Rock n Roll, Rock n Roll, this is Jazz,
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| | read up on the TCP/IP and DNS layers and
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| do you read me, over". If someone on Jazz
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| | specifications (have fun, and have a good
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| was listening, they would say "Rock n
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| | supply of coffee ready).Similarly, they
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| Roll, this is Jazz, go ahead, over".
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| | are not trying to understand how the
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| Bingo!, they have a connection.The same
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| | information that is received is displayed
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| kind of thing happens when you type an
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| | so nicely in your browser. That is a
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| address into your web browser and hit
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| | higher layer and yet another
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| "Go". Your computer is just moving a
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| | specification (HTML).I hope you enjoyed
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| bunch of numbers to the modem. To keep
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| | reading this article, it has taken an
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| things simple, lets ignore that the modem
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| | unusual perspective of HTTP! If you want
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| is converting those numbers into sounds,
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| | to read up on the details there are a
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| and pretend that it is those numbers that
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| | number of good articles on the web and
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| are traveling out along your phone line.
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| | the HTTP specification itself.
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| The reason sending numbers out along your
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|
