Chap2 HTTP

Chap2 HTTP - • • # " " – ! Many...

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Unformatted text preview: • • # " " – ! Many slides in this document adapted from materials for Kurose and Ross, Computer Networking, 5th edition. copyright 1996-2009 J.F Kurose and K.W. Ross, All Rights Reserved – ! – ! – – – – $ %%& '%& () %& & &* + & ) ,-( • – &+ ( ! • • " • • • && • • • • • • !! ! + & ! – – – / ! 11 " 0 " –– ! ! ! ! ! ! ! ! ! * . • –+ ! ! ! •& •$"! / &0 & !& & – – – – – – –! + !! & " ! + !! & ! ! 2 3 4 •5 •4 •5 ! ! , ! 61 .7 2 63 8 ) ! • • ! • & " ! && ! !! & ! : ! + & 9 $"! ( !& & +&& & & & 1 • ( " / ! (0 1 • ! " # Ì&& = – – – <! 0 " <! ! ! !! / && ! + – – !" ! • " !! + !! & ! + !! & ; • ( • • – – ! ! ! ! ! " ! host or server host or server controlled by app developer ! ! •% # – 11 ! > process socket TCP with buffers, variables process socket •) – ! ! # ! = ! Internet TCP with buffers, variables •) – ! &" ! •! ! ?' • • 1 1 $ %%& () %& 7% & • 11( " controlled by OS •? != ! ! % Application file transfer e-mail Web documents real-time audio/video stored audio/video interactive games instant messaging > Data loss no loss no loss no loss loss-tolerant loss-tolerant loss-tolerant no loss Throughput elastic elastic elastic audio: 5kbps-1Mbps video:10kbps-5Mbps same as above few kbps up elastic Time Sensitive no no no yes, 100’s msec yes, few secs yes, 100’s msec yes and no + %& • > • ! • • ! • !! B " A , &: :C ! ! @ !" " ! • A ,& • " ! " " ! ! ! ! * . + Application e-mail remote terminal access Web file transfer streaming multimedia Internet telephony Application layer protocol SMTP [RFC 2821] Telnet [RFC 854] HTTP [RFC 2616] FTP [RFC 959] HTTP (eg Youtube), RTP [RFC 1889] SIP, RTP, proprietary (e.g., Skype) Underlying transport protocol TCP TCP TCP TCP TCP or UDP typically UDP C" ' •C" • "D •C" •5 • 5# D " $ %) ! "D "D !! A? ! $ %%& E ! A? ! F "D E&54 " $ %) "" www.someschool.edu/someDept/pic.gif 2 3 $ %%& $ %%& • • C "@ ! – "D – "D > ) - $ %%& A • & 5# / $ %%& G " > • !0 H # %& / 9 %& 0 %& & $ %%& # / %%& $ / %%& $ %& / 0 Ì Ì !" " 0 !C " 0 ! " G! C" > HC " ( • • C" ! G #I / ! G ! H " 0 " H ! " • 8 9 * ( $ %%& - $ %%& / .1 $ %%& 10 %& 1 (contains text, A ? www.someSchool.edu/someDepartment/home.index references to 10 jpeg images) 1 $ %%& %& $ %%& / 0 www.someSchool.edu on port 9 21 $ %%& "1 $ %%& www.someSchool.edu %& G H 91 ! ! 1& !D 2 "D ! "D 31 ( D 1 $ %%& / ! $ %%& A? 0 1) %& *1 $ %%& > ! > ! "D ! ! "D someDepartment/home.index ; , & ?%% !" 1 $ %%& ? • • %& ? %% > & $ %%& ?%% ! & • • • " "D %& ! • $ %%& $ %%& ! "> " ! "D > ! • ?%% ! "D $ %%& 1 $ %%& > ( "D %& ? • • ! • ?%% ?%% $ %%& " %& > $ %%& ? %% ! J ?%%K time time • , $ %%& • • $ %%& – > $ %%& > $ %%& > !" 0 ( +/ + > / 5% & (% 4 $5 , !0 ! GET /somedir/page.html HTTP/1.1 Host: www.someschool.edu User-agent: Mozilla/4.0 Connection: close Accept-language:fr (extra carriage return, line feed) ! ! ! * . . A & •C" •+ "! ! ! ! !! A? •A •+ ! ! 4 5% > ! !! $ %%& 1 • 4 5% • & (% • $5 , A? – > ! "D ) ! $ %%& 1 • 4 5% & (% $ 5 , • &A % – ! ! A? ! ! "! ! • , 5 5%5 –! A? www.somesite.com/animalsearch?monkeys&banana 2 3 $ %%& / ! 0 ! A ) DC" ' 0 0 *0 .0" !" !! @" " C" ! ! $ %%& $ %%& @ HTTP/1.1 200 OK Connection close Date: Thu, 06 Aug 1998 12:00:15 GMT Server: Apache/1.3.0 (Unix) Last-Modified: Mon, 22 Jun 1998 …... Content-Length: 6821 Content-Type: text/html data data data data data ... 5# •( + • • – – ! > " $ %%& + , " + , & > ! > $ %) 11 ! ! 8 9 G H/ 1 0 C • • • • 0 " ! ! " $ Ì Ì G ! H / " < Ì ! Ì " !0 ! ! ebay 8734 > < + , 389 ebay 8734 amazon 1678 Set-cookie: 1678 > ! /" C cookie: 1678 ! ebay 8734 amazon 1678 cookie: 1678 > ; * 2 C" 4 > / C" # 0 • " • 1> " ! !" J J2 @ &# "D <J # " + • •" > – – "D " ! $ %%& • 2) " "D > "D "D • • • ! J > < < ! K K J+ -! K - J 2L J ! K ! L )" - * * # " • " !! )" - J 2L ! K K J+ -! K ! ! J 2L K / " + 0 " • 1 . # / " + 0 > • )" > • • • J • < < % ! .L 3L < 3L ! > ! > " !" ! " ! 2) " • • )" - ! )" - / • ! K ! 1 3M/ 1 0 N1 . 0 J+ K -! K1 .M ! J ! ** *. ! • • 4 ! @ ! ! "D ! ! 4 5% $ %%& > ! $ %%& > If-modified-since: <date> If-modified-since: <date> "D ! ! $ %%& HTTP/1.0 304 Not Modified • "D ! HTTP/1.0 304 Not Modified ! $ %%& > If-modified-since: <date> "D ! ! $ %%& HTTP/1.0 200 OK <data> *2 3 ...
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