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Services (Web application (similar to desktop application, can build…

- - - - presentation Tier (Web browser + Web server): here web server just handles the requests, processing is done in application layer.
      - Application Tier (Application server): application layer can call other web services. in short, it is the processing layer.
      - Data Tier (Database: can be read only or read/write)
      - Not all systems may need all three layers, depending on need
  - - - request-line
        
        request method(GET, PUT..)
        
        uri (/resource/...)
        
        protocol (HTTP/1.1)
      - Headers
      - blank line
      - message body(optional)
        
        if message body:
        
        content length header
        
        content type header
    - - status-line
        
        protocol version
        
        status code
      - Headers
      - blank line
      - message body
        
        if message body:
        
        content length header
        
        content type header
      - more optional headers
    - - URI needs to be ASCII
    - - GET
        
        query string may contain the variables
      - PUT
        
        URI contains the resource information and update information is passed in the message body
      - POST
        
        data is sent in message body
      - DELETE
  - - - Client
      - IDL
        
        defines protocol, tell what services available at server
        
        responsible to establish connection with server, called binding
        
        formatting data
        
        send remote procedure call
        
        receive server stub response
      - Server