IBM dwLive, "Internet & HTTP - 잃어버린 패킷을 찾아서..."

Internet! & HTTP!
잃어버린 패킷을 찾아서…

이동욱
2009.12.05

dugan.lee@gmail.com
http://nephilim.tistory.com
1

HTML(5?)
CSS
Javascript/Ajax

HTTP Javascript Library
Comet
Flash/Flex
RoR, Django
PHP, Servlet/JSP,
ASP…

1990 2009

2 그림 출처 - http://en.wikipedia.org

1

1-1 1-2

1-1-1 1-1-2 1-2-1 1-2-2

3

HTTP

…

javascript 기타 기술들…
WWW Server-Side (아악!)
Ajax
Scripts
Comet…

4

HTTP Request

1
GET / HTTP/1.1
Host: 127.0.0.1:8080
User-Agent: Mozilla/5.0 …
Accept: text/html,application/xml;…
Accept-Language: ko-kr,ko;q=0.8,en-us
Accept-Encoding: gzip,deflate
Accept-Charset: EUC-KR,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive

5

HTTP Response

2
HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Accept-Ranges: bytes
ETag: W/"331-1259569714921"
Last-Modified: Mon, 30 Nov 2009 08:28:34 GMT
Content-Type: text/html
Content-Length: 331
Date: Mon, 30 Nov 2009 08:32:30 GMT

<html>
<head>
<title>IBM PetchaKucha</title>
</head>
<body>
Hello Web World!
<hr/>
<font color="red" size="10"> 안녕하세요</font>
</body>
</html>
6

많은 Resource들

<html>
<body>
<img src="images/h.png" />
<img src="images/t.png" />
<img src="images/t.png" />
<img src="images/p.png" />
</body>
</html>

(ex) jQuery UI http://jqueryui.com/themeroller/images/?new=2e83ff&w=256&h=240&f=pn
7 g&fltr[]=rcd|256&fltr[]=mask|icons/icons.png

1
Resource 일부 GET /wicket/1.4.3/apache-wicket-1.4.3.zip HTTP/1.1
Host: apache.mirror.cdnetworks.com
User-Agent: Mozilla/5.0
Accept: text/html,application/xhtml+xml,application/xml
Accept-Language: ko-kr,ko;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: EUC-KR,utf-8
Keep-Alive: 300
Connection: keep-alive
Referer: http://apache.mirror.cdnetworks.com/wicket/1.4.3/
Range: bytes=21341986-
If-Match: "d20802f-1d98c87-476447ce3cc00"
If-Unmodified-Since: Mon, 19 Oct 2009 07:13:52 GMT

2
HTTP/1.1 206 Partial Content
Date: Tue, 01 Dec 2009 15:38:24 GMT
Server: Apache
Last-Modified: Mon, 19 Oct 2009 07:13:52 GMT
ETag: "d20802f-1d98c87-476447ce3cc00"
Accept-Ranges: bytes
Content-Length: 9692517
Content-Range: bytes 21341986-31034502/31034503
Keep-Alive: timeout=15, max=1000
Connection: Keep-Alive
Content-Type: application/zip

D/0k…(파일 내용)…
8

Form

<form action="/" method="post">
<input name="key1" value="value1-1"/>
<input name="key1" value="value1-2"/>
<input name="key2" value="value2"/>
<input type="submit"/>
</form>

1
POST http://192.168.0.100:8080/ HTTP/1.1
Host: 192.168.0.100:8080
…(중략)…
Content-Type: application/x-www-form-urlencoded
Content-Length: 39

key1=value1-1&key1=value1-2&key2=value2

9

Form (계속)

<form action="/" method="post">
<input type="checkbox" name="checked" value="1"/>
<input name="userdata" value="value1"/>
<input type="submit"/>
</form>

1
POST http://192.168.0.100:8080/ HTTP/1.1
Host: 192.168.0.100:8080
…(중략)…
Content-Type: application/x-www-form-urlencoded userdata의 개수 = 3개
Content-Length: 51 checked의 개수 = 2개!

check=1&userdata=value1&userdata=value2&check=3&userdata=value3

10

Redirection
1
GET http://yahoo.co.kr/ HTTP/1.1
Host: yahoo.co.kr
…

2
HTTP/1.1 301 Moved Permanently
Location: http://kr.yahoo.com
Vary: Accept-Encoding
Content-Type: text/html; charset=utf-8
Age: 533
Content-Length: 81

1
GET http://kr.yahoo.com/ HTTP/1.1
Host: kr.yahoo.com
…

2
HTTP/1.1 200 OK
Content-Type: text/html
…

11

Server-side (Java)

public class RedirectServlet extends HttpServlet {

@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setStatus(302);
response.setHeader("Location", "http://www.google.com");
}
}

response.sendRedirect("http://www.google.com");

12

조건부 GET (캐싱)
1
GET http://www.google.co.kr/… HTTP/1.1
Host: www.google.co.kr
…(중략)…
If-Modified-Since: Tue, 10 Nov 2009 23:51:53 GMT
Cache-Control: max-age=0

2
HTTP/1.1 304 Not Modified
Date: Mon, 30 Nov 2009 16:25:58 GMT
…

이후 브라우저가 Caching한 해당 리소스 표시

13

벌써 마무리…

칼텍의 동료 교수 핚 사람이 파인만에게 질문을 던졌다.
“스핀이 1/2인 입자들이 페르미디랙의 통계를 따르는 이유가 뭘까?”
파인만은 이렇게 말했다.

“그 내용으로 1학년생들을 위핚 강의를 준비해 보겠네.”
그러나 몇 주가 지난 후에 파인만은 솔직하게 털어 놓았다.

“자네도 짐작했겠지만, 아직 강의 노트를 만들지 못했어. 학부 1학년생들
도 알아듣게 설명핛 방법이 없더라구. 그러니까 내 말은, 우리가 아직 그것
을 제대로 이해하지 못하고 있다는 뜻이야. 내 말 알아듣겠나?”

- 파인만의 물리학 강의 중-

14

참고 자료

URL
http://www.w3.org/Protocols
http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol
http://www.w3.org/2001/tag/webarch
http://www.ietf.org/rfc/rfc3986 - URI
http://code.google.com/intl/ko/apis/gdata/docs/2.0/reference.html#ResourceVersioning

서적
Chuck Musciano and Bill Kennedy, HTTP: The Definitive Guide, 2nd Edition, Oreilly, 1998
Leonard Richardson and Sam Ruby, RESTful 웹 서비스 : 웹 서비스의 짂화, 정보문화사, 2008
리차드 파인만, 파인만의 물리학 강의, 승산, 2004

도구
cURL (http://curl.haxx.se )
wireshark (http:// www.wireshark.org)
paros (http:// www.parosproxy.org )
firebug (https://addons.mozilla.org/ko/firefox/addon/1843)
google chrome (http://chrome.google.com)

15

IBM dwLive, "Internet & HTTP - 잃어버린 패킷을 찾아서..."

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