Short Intro of Java Web Application

1. Web Application

• Collection of web pages and resources.
• Web Pages can be static (HTML) or dynamic (processed at server)

       2. HTTP Protocol

• Connection-less, state less
• request response model

            2.1 HTTP Request

• From Browser to Web Server using URL.
• http://servername:port/application/webpage

            2.2 HTTP Response : 

• From Web Server to Browser

            2.3 HTTP Request Methods
                GET :
                        - data sent via URL (query-string)
                        - not secure
                        - send limited data (browser URL address is limited up to 2K character)
                        - faster
                POST :
                        - data is sent via request body
                        - secure
                        - no data limit
                        - slower
                HEAD :
                         - response only contains header not body
                PUT :
                         - for upload/put a file on web server
                 DELETE :
                         - for delete a file on web server
                 TRACE :
                         - for tracing http req/res data
                  OPTION :
                         - to know which methods supported on server