Web Application Architecture

1. Client-Server Architecture

• Separating where resources like product information exist and apps that use resources is called 2-tier architecture

• Client: App that uses resources

• Server: Place that provides resources

2. Characteristics of Client and Server

• Client and server have a request-response relationship

• In client-server architecture, request comes first, then response follows

• Server only plays the role of delivering resources

• Space where resources are stored is called database, and form with added DB is called 3-tier architecture

3. Types of Client and Server

• Clients are distinguished by platform:

  • Client in web platform mainly used through browser: website or web app

  • Apps like iOS, Android can also be clients

• Servers differ by what they do (mail server, file server, web server, etc.)

4. Client-Server Communication and API

• In web application architecture, client and server communicate using HTTP protocol

• At this time, server provides interface for clients to utilize resources well, which is called API (Application Programming *Interface) (*Interface: contact point made for communication to be possible)

• API documentation must be written for clients to utilize it