Http and Chrome dev tools

Http header

• Host: send to where, dns lookup
  
• Referer: linked from where,
  
• User-Agent: browser, os
  
• Cache-Control:
  
  • static: can cache
    
  • non-static: cannot cache
    
• Date: timestamp
  

Http request methods

GET
HEAD
POST: post data
PUT: store data
DELETE
TRACE
OPTIONS
CONNECT

status

304: cached content

Restful api

reasons: - single page application
- mobile and other services

Representational State Transfer

Resources

Representational

Accept: xml json etc

State Transfer

Stateless

1. No client state at server
   
2. Any State is maintained at Client side
   
3. Each request has all the information to process the request: the same url/request will get the same response
   

Restful api: Good examples:

• A URL indentifies a resource
  
• URLs should include nouns, not verbs
  good: Post https://url
  bad: https://url/post
  
• Use http verbs(GET, POST, DELETE, PUT)
  | POST | GET | PUT | DELETE | |-|-|-|-| | CREATE | READ | UPDATE | DELETE |
• Use plural noun only for consistency, not single
  
• don’t need to go deeper than resource/identifier/resource
  
• put version number at your api
  
• specify optional fields in a comma seperated list
  
• example: need to tradeoff
  not rest: POST www.url.com/login
  restful: GET www.url.com/users/{username}