The document discusses DNS resolution and the HTTP protocol. It provides diagrams that outline how a DNS request is resolved from the local computer to root servers, then to name servers for specific domains to retrieve IP addresses. It also describes aspects of HTTP like requests, responses, status codes, headers, cookies and sessions. Common web servers like Apache and Nginx are mentioned, along with how to configure them. PHP frameworks are also briefly discussed regarding MVC patterns and common framework components.

2. •
•
• http://panweizeng.com

5. • http://meituan.com

6. • http://meituan.com
• hosts

7. • http://meituan.com
• hosts
• localhost 127.0.0.1

8. • /etc/nsswitch.conf
• /etc/hosts
• /etc/resolv.conf

9. Mail Client
Web Browser
cache 1-30mins
Clients Programs
Your Computer

10. Mail Client
Web Browser hosts
cache 1-30mins
Clients Programs
Your Computer

11. Mail Client
Web Browser hosts DNS Resolver
cache 1-30mins
local cache
Clients Programs
Your Computer

12. Mail Client
Web Browser hosts DNS Resolver
cache 1-30mins
local cache
Clients Programs
Your Computer

13. Your Computer

14. Local Name Server / Your ISP
1
Your Computer

15. Local Name Server / Your ISP Root Name Server
2
1
Your Computer

16. Local Name Server / Your ISP Root Name Server
2
1
Your Computer

17. Local Name Server / Your ISP Root Name Server
2
3
Com Name Server
1
Your Computer

18. Local Name Server / Your ISP Root Name Server
2
3
Com Name Server
1
Your Computer

19. Local Name Server / Your ISP Root Name Server
2
3
Com Name Server
4
Meituan Name Server
1
Your Computer

20. Local Name Server / Your ISP Root Name Server
2
3
Com Name Server
4
Meituan Name Server
1
Your Computer

21. Local Name Server / Your ISP Root Name Server
2
3
Com Name Server
4
Meituan Name Server
1 5
Your Computer

22. Local Name Server / Your ISP Root Name Server
2
3
Com Name Server
4
Meituan Name Server
1 5
6
Your Computer Meituan Web Server

23. • meituan.com
• www.meituan.com

24. • dig meituan.com
• dig +trace meituan.com
• dig www.meituan.com
• dig s0.meituan.com

25. HTTP
• Hypertext Transfer Protocol

26. HTTP
• Hypertext Transfer Protocol
• HTTP

27. HTTP
• Hypertext Transfer Protocol
• HTTP

28. client server

29. request
client server

30. request
client server
response

31. • GET /path/to/file/index.html HTTP/1.0

32. • HTTP/1.0 200 OK

33. • 404 Not Found
• 500 Server Error

34. • 301 Moved Permanently
• 302 Moved Temporarily
• 304 Not Modified
• 401 Unauthorized
• 403 Forbidden
• 502 Bad Gateway

35. Request Headers
• Host: www.meituan.com
• User-Agent:Mozilla/5.0 (Macintosh; Intel
Mac OS X 10.6; rv:2.0.1) Gecko/20100101
Firefox/4.0.1

36. AJAX
• X-Requested-With: XMLHttpRequest

37. Response Headers
• Server: nginx
• Date: Mon, 20 Jun 2011 09:12:11 GMT
• Content-Type: application/json;
charset=utf-8;
• Content-Length: 138

38. •
• cookie
• session

39. •

40. Apache
• HTTP Server

41. • sudo /etc/init.d/httpd start
• sudo /etc/init.d/httpd stop
• sudo /etc/init.d/httpd restart/graceful

42. Mac
• sudo apachectl start

43. • /etc/httpd/conf/http.conf
• /etc/http/conf/vm/*

44. • ServerRoot "/etc/httpd"
• DocumentRoot "/opt/www/webroot"
• Listen 80

45. • User apache
• Group apache
• LoadModule php5_module /usr/lib64/
httpd/modules/libphp5.so

46. • DirectoryIndex index.php index.html
• AccessFileName .htaccess
• ErrorLog /opt/logs/error_log
• ErrorDocument 404 /not-found.html

47. <Directory />
Options FollowSymLinks Indexes
AllowOverride None
</Directory>

48. <VirtualHost *:80>
ServerName www.xpmt.com
ServerAlias *.xpmt.com
DocumentRoot /home/panweizeng/mt/webroot
RewriteEngine on
RewriteRule ^/(static/.*)$ /$1 [L]
RewriteRule ^/(.*)$ /index.php [L]
</VirtualHost>

49. <VirtualHost *:80>
ServerName xpmt.com
RewriteEngine On
RewriteRule ^/(.*)$ http://www.xpmt.com/$1 [L,R]
</VirtualHost>

50. Nginx
• HTTP server
• load balancer

51. apache

52. nginx
ngnix

53. ngnix
nginx
apache apache ... apache apache

54. •

55. PHP Framework
•
•

56. where to start
• apache config
• webroot/index.php

57. index.php
if ($redirectTo = checkSource()) {
header("Location: $redirectTo");
die;
}
ControllerFront::getInstance()->dispatch();

58. • ControllerFront::importConf
• router config
URL

59. dispatch
• URL
•
• Request
• ControllerAction::runAction

60. runAction
• Action
• Plugin
•

61. • classes/*

62. • Core.php
• Obj.php
• DBObj.php
• DB.php

63. • Cookie.php
• Session.php
• Cache.php

64. • Debug.php
• Log.php
• Loader.php

65. • Request.php
• Response.php

66. • ControllerFront.php
• ControllerAction.php
• ControllerActionPlugin.php
• ControllerBusiness.php

67. • prepend.php(php -i |grep prepend)
/opt/www.config/prepend.php
• prepend.php
~/mt/config/prepend.php
•
config/*

68. prepend.php
• ROOT/TS/DOMAIN_HOST
• include_path
•
• Debug
• autoload

69. autoload
• Loader::registerAutoload
Loader::load
• class/Model/Controller/Helper

70. • http://bj.meituan.com/deal/959830.html
• http://bj.meituan.com/deals/page2

71. • Macbook apache+php
+mysql
• mini web framework php/python/
ruby router
dispatcher orm
•