HTML 5 introduction
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.
- The Request
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
- Internet Protocol Version 4(Ipv4) users number format of xxx.xxx.xxx.xxx to identify each domain
- document - what specific file is needed
- Most page are made up of multiple files
- protocol - how to connect
