User:Muffingg/Java Web

Enterprise Application

1. Large Data
2. Multiple Functionalities
3. Client-Server
4. Multi-threading
5. Highly Available
6. Scalable

When typing in www.google.com...

• Browser first opens a connection
• It then sends an http request to a Web Server
• Web server sends http response
• DNS converts the Domain Name to the IP Address of the website

HTTP Request (generated by Browser)

• Starts with HTTP Version
• URL
• GET and POST (either receive some information from the client, or send/submit some information from the client to the server)

e.g.

 HTTP1.1 url/get
 
 
 HTTP Request Headers (Firefox/Chrome/etc), e.g. hostname, version, etc
 
 
 Request data [optional]

HTTP Response (generated by Server)

e.g.

 HTTP Response
 HTTP1.1/200
 
 
 Response header
 text/img/gif...
 body (very likely to have an HTML page)

HTTP Error Codes

• See also List of HTTP status codes
• 2xx: SUCCESS
• 4xx: ERROR
• 5xx: SERVER ERROR