HTML5

HTML 5 introduction

一个不错的博客

3.19

Succeeding in This Class

• Create a community
  • In a perfect world you would code with a friend...so use the message boards.
• Work Smart!!
  • Never spend more than 20 minutes on a problem
• Look things up on your own!
• Practice, practice, practice!

Client/Server Relationship

• Servers
  • Machines that hold shared resources
  • Always connected to the network
• Clients
  • Machines for personal use(laptops, phones, etc)

Request/Response Cycle

• This is what happens when you computer(the client) requests a page and a server responds with the appropriate files.

  • The Request
    • Once the IP address is determinded, the browser creates and HTTP request.
    • Lots of hidden information in the request
      • header, cookies, form data, etc
  • The Response
    • It is up to the browser to decide what to do with those files
    • If the server can't fulfill the request it will send back files with error codes: 404, 500, etc.

Uniform Resource Locator

• URL - three parts:
  • protocol - how to connect
    • HTTP - Hypertext Transfer Protocol
    • HTTPS - Secure Hypertext Transfer Protocol
    • FTP - File Transfer Protocol
  • domain - where to find the document you want
    • top-level domain .com .org .edu
    • IP Addresses and the Domain Name Server(DNS)
      • Internet Protocol Version 4(Ipv4) users number format of xxx.xxx.xxx.xxx to identify each domain
        • can represent over 4 billion unique combinations(2^32)!
      • DNS looks up the domain and returns the IP address
  • document - what specific file is needed
    • Most page are made up of multiple files