Web Services

Web Services

1. HTTP

   • HyperText Transfer Protocol
     • Features
       • Connectionless
         • Client Disconects
       • Media Independent
         • MIME Type
       • Stateless
         • No information retained
     • Architecture
       • Request/Response Protocol based on the client/server based Architecture
       • Request
         • Method
           • GET | POST | PUT | DELETE
         • URI
           • Uniform Resource Identifiers
         • Version
         • Headers
         • Encoding
         • Media Type
       • Response
         • Status Code
           • 1xx: Informational | 2xx: Success | 3xx:Redirection | 4xx: Client Error | 5xx: Server Error
   • TCP/IP based communication protocol
   • Application-Level Protocol
   • Deliver data on the World Wide Web
   • Default Port 80
   • Provides Standarized way for computers to communicate
     • How Clients Request data will constructed
     • Sent to the Server
     • How the server respond to these request

2. RESTful

   • REpresentational State Transfer
   • Web Standard based Architecure
   • Uses HTTP Protocol for data communication
   • Constructing a Standard URI
     • Use Plural Nouns
     • Use lowercase letters
     • Use HTTP Verbs
     • Use underscore or hyphen
   • Data and resources are represented using URIs
     • Categories: Define and group information into entities with common characteristics
     • Treats every content as resource

3. Is a collection of open protocols and standards used for exchanging data between applications

4. API

   • Application Programming Interfaces
   • Interface to allow applications talk to each other
   • Provides information for how to communicate with a software component
     • Operations (What to call)
     • Inputs (What to send with a call)
     • Outputs (What you get back from a call)
   • Types
     • Traditional
     • Web APIS
       • SOAP
       • RPC
       • REST

5. Is a method of communication that allows two software systems to exchange data over the internet