======  Web Application Frameworks ======

**Supporting**: [[eg-259:lecture20|Lecture 20]]. 

   - How many layers are there in the web-tier? 
   - What part of the HTTP request is converted into an application request? 
   - What media types does a web application typically generate? 
  - Aside from scripting, what server-side issues do web application developers need to consider? 
  - Which languages go into the database access layer in a three-tier system? 
  - Which language is often used to define the mappings between the cliner and database tiers and the middle tier? 
  - What is a //leaky abstraction// and why does the three-tier model leak as an abstract model of web applications? 
  - What is the principle purpose of a web application development framework? 
  - What is the principle difference between an action-based and an component-based web application framework? 
  - What is the principle design pattern that informs the design of most web-application frameworks? 
  - What is the name of the software design pattern that forms the database abstraction that is used in Ruby on Rails? 
  - Name and describe the two principle design features of Ruby on Rails. 
  - Which software design patterns are present in Ruby on Rails? 
  - Describe briefly how model-view-controller has been implemented in Ruby on Rails. 
  - How is the database configuration defined in a ruby on rails application? 
  - Why does rails have three different database connection configurations for //development//, //testing// and //deployment//? 



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