6. A standard HTTP request Request hello.HTML Browser Server hello.HTML <h1>Hello</h1> goodbye.HTML <h1>Hello</h1>

7. A standard HTTP request Response Browser Server hello..HTML <h1>Hello</h1> goodbye.HTML <h1>Bye</h1> <h1>Hello</h1>

8. A standard HTTP request Hello

9. A CGI Request Request hello. PHP Browser Server hello.PHP Echo “Hello”; goodbye.PHP Echo “Goodbye”;

10. A CGI Request Response hello.PHP Echo “Hello”; Browser Server goodbye.PHP Echo “Goodbye”; <h1>Hello</h1>

11. A CGI Request hello.PHP <?php echo “ <h1>Hello</h1> ”; ?>

12. A CGI Request Hello

13. Server Side vs Client Side Javascript Java Flash PHP Java ASP Client Server HTTP

15. Variables Name Price John 16.50

16. Variables Name Price Pete 16.50

18. Input A PHP script Get Post Database Cookies Files Server Info To Do:

19. Output A PHP script HTML Database Cookies Files To Do:

30. Let’s Design an App Twaddl.com What have you done today? Update Cooked a curry Went to work Jogged 2 miles

31. Twaddl Database ID Twaddl 1 Argued with girlfriend – again! 3 Went to work 4 Cooked a curry 2 Jogged 2 miles

32. Twaddl Main Program Flow Handle posted twaddl List twaddles

33. Handle Posted Twaddl Is submitted twaddle empty? Insert twaddle into database List twaddles No Yes Display an error message

34. List Twaddles Get list of twaddles from database End Program For each twaddle in list: Display twaddle