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HTTP and JSON

Todi Adiyatmo, ST., M.I.T.

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Examining HTTP Request Under the hood

Curl The popular command line tool to create web

request

JSON

File Example available on ~layanan_web/code/curl

Topic Outline

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Before we learn about web service, its betterfor us to learn how HTTP request really work The protocol

The Header The Respond

The method involved

HTTP Request

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HTTP Request

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Chrome is a mandatory browser in this class

Chrome developer tools (f12) Analyze behind the hood

Request response CSS Editing

Javascript debugger

Etc

Chrome Developer Tools

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The request and response is done in HTTP

Web Server acting as Server and client

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Command line tool providing library for datatransfer across various protocol

Available in linux and PHP PECL module

Curl is going to be one of your primary toolwhen calling and Web Service API

Using HTTP Protocol to read data fromvarious language / System ! (Cross Platform)

Curl

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Curl in action (HTML Data)

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Curl in action (JSON Data)

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Network Stack

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Cross Platform API Service

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We can write http request with differentProgramming Language Easyly JAVA

PHP Ruby

ASP

Every Programming Language have build a

http library

HTTP Programming Library

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Load your PHP Curl extension first

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Curl in PHP

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Result :

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Examine the Request and Response

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Data.php (JSON Server)

JSON_Client.php (Client)

Simple Server - Client

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Data.php

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JSON_Client.php

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Javascript Object Notation

Kalkulator Atribut : merk, pemilik

JSON

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JSON (2)

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Other more complex example

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Simple Structure

Can be eval() at javascript side, easier codeexecution

Easy to read (when properly formatted)

Why JSON

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Network Request

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And response..

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Common HTTP Status

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2xx Success

3xx Redirect

4xx Client Error

5xx Server Error

http://en.wikipedia.org/wiki/List_of_HTTP_status_codes

Common HTTP Status (2)

http://en.wikipedia.org/wiki/List_of_HTTP_status_codeshttp://en.wikipedia.org/wiki/List_of_HTTP_status_codeshttp://en.wikipedia.org/wiki/List_of_HTTP_status_codeshttp://en.wikipedia.org/wiki/List_of_HTTP_status_codes

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200 Ok Should be in most response

201 Created

After creating RESTfull instance 202 Accepted

Upload file

204 No Content

Remember this code for later use

2xx Code - Success

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301 Move Permanently Access google.com -> google.co.id

304 Not Modified

Cache mechanism

3xx Code - Redirect

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400 Bad request ( broken request header bad network)

401

Unathorized 403

Forbidden ( access to restricted area)

404 Page not found

4xx Code Client Error

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500 Server Error (When your server is broken)

501

Not implemented (API) 502

Bad gateway

508 Loop Permanent loop (bad code)

5xx Server Error

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The response code is important for the RESTweb service were going to build

Remember the important code

200 301

403

404

501

Important Notes

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http://secretgeek.net/json_3mins.asp

More at :

http://secretgeek.net/json_3mins.asphttp://secretgeek.net/json_3mins.asp