React Four

HTTPS, REST, Axios

How the Web Works

Client-Side

Server-Side

Request

Response

What is HTTP(S)?

HTTP stands for Hyper Text Transfer Protocol, which is the protocol we follow for transferring information over the internet.

 

The (S) stands for secure. More specifically, your webpage is using a SSL, or Secure Sockets Layer. The layer encrypts your http requests.

 

HTTP requests are made through URL's.

Structure of URL's

URL stands for Uniform Resource Locator, and is a mixture of three parts that make up an HTTP request:

https://devmountain.com/about.html

Protocol, either HTTP or HTTPS

Domain

Endpoint

REST and RESTful API's

API stands for Application Programming Interface, and is a place to send and retrieve data from a server.

 

REST is a design concept for transferring data.

 

To make an API RESTful, it must be able to be interacted with in four ways:

GET - Able to Retrieve Data

POST - Able to Add Data

PUT - Able to Update Data

DELETE - Able to Delete Data

CRUD

CRUD is a model that follows the REST concept.

It is an acronym that consists of all the things you need to make an API complete:

CREATE (POST)

READ (GET)

UPDATE (PUT)

DELETE (DELETE)

Axios: Setup

Axios is a library that helps structure http requests. To use Axios in your project, you need to install it:

npm install axios

Next, import axios to the component that will be making the HTTP Request:

import axios from 'axios';

Axios: Implementation

To create an HTTP request with axios, reference axios, and then invoke the RESTful method for the request.

 

The first argument passed into the method should be the URL you are making the request to:

axios.get('http://swapi.dev/api/people/1')

use axios

REST Method

Requested URL

Axios: Implementation

When the request is made, a promise is returned.

 

A promise is a special object in JavaScript that will hold the response from our request.

 

To handle promises, we use the .then( ) and .catch( ) methods that fire depending on whether the request was successful or not.

axios.get('http://swapi.dev/api/people/1')
.then(response => {
  console.log(response.data)
})
.catch(error => {console.log(err)})

Successful Request Functionality

Failed Request Functionality

Sending Additional Information

Sometimes you need to request more specific information, like a specific profile on a social media platform.

 

This is where params, query, and the body object come in.

http://example.com/people/1

http://example.com/people?name=Matias

axios.post('http://example.com/people', {name: 'Matias', age: 26})

params:

query:

body:

Params

Params is short for parameters.

 

Params are a way to request more specific information from an API.

 

Params are added to the end of the url, separated with a '/' slash. 

Endpoint

https://swapi.dev/api/people/1

Param

The above example would grab the person with the ID of 1 from swapi.

https://swapi.co

Query

Queries are another, more dynamic way to request specific information from an API.

 

A query is started with the '?' symbol, followed by key value pairs separated by the = sign. Multiple queries can be separated with the & sign.

 

 The key is what data you're looking for, and the value is the specific value for that type of data (such as an ID or name)

Endpoint

http://example.com/people?name=matt

Query

The above example would request a person with the name of Matt from example.com

The Request Body

The request body is another place we can use to send additional information to an API.

 

The request body is an object that is not part of the URL, but included after the URL in a request.

 

It is a great option for adding or updating data. (Think CRUD!)

URL

axios.post('https://example.com/people', {name: 'Matt', age: 27})

Body

The above example would add a person with the information in the body object.

JSON

JSON stands for JavaScript Object Notation.

 

JSON is the preferred format for sending data across HTTP requests.

 

JSON allows us to transfer information across different languages.

 

JSON looks similar to a JS object, but all keys are wrapped in double quotes.

{
  "name": "Cole",
  "age": 27,
  "hobbies": [
    "wearing hats indoors",
    "video games"
  ],
  "car": {
    "make": "Toyota",
    "year": 2017
  }
}

React 4

By Devmountain

Source: Matthew Bodily

React 4

HTTPS, REST, CRUD, Axios, and Asynchronous/Synchronous Code

  • 1,105

More from Devmountain