Making a request

Several Options:

• axios

• requests

• fetch(HTML5?)

• raw XMLhttprequest(native)

• jquery

Axios

Promise based HTTP client, best

const axios = require('axios');
import axios from 'axios';

//GET
axios.get("/event", { params: { api_key })
  .then(response => {
    console.log(response.data.url);
  })
  .catch(error => {
    console.log(error);
  });

//POST
axios.post('/user', {
    firstName: 'Fred',
    lastName: 'Flintstone'
  })
  .then((response) => {
    console.log(response);
  })
  .catch((error) => {
    console.log(error);
  });

axios.get(url[, config])

axios.post(url[, data[, config]])

Error Handling

• err.response.status if any other server status than 2xx

• err.request if request was made without a response

• err.message === "Network Error" special network error case

• err.message if something while setting up request

axios.get('/user/12345')
  .catch(function (err) {
    if (err.response) {
      console.log(err.response.data);
      console.log(err.response.status);
      console.log(err.response.headers);
    } else if (err.request) {
      // `error.request` is an instance of XMLHttpRequest in the browser and an instance of http.ClientRequest in node.js
      console.log(err.request);
    } else if(!err.status) {
      console.log(err.message);
    } else {
      console.log('Error', err.message);
    }
    console.log(err.config);
  });

Auth Bearer

const config = {
    headers: { Authorization: `Bearer ${token}` }
};
const bodyParameters = { key: "value" };
axios.post( 
  'http://localhost:8000/api/v1/get_token_payloads',
  bodyParameters, config);

Setting up base

const instance = axios.create({
  baseURL: 'https://some-domain.com/api/',
  timeout: 1000,
  headers: {'X-Custom-Header': 'foobar',  Cookie: "cookie1=value; cookie2=value; cookie3=value;"}
});

instance.get(...)

Multiple Requests

axios.all([
  axios.get('https://api.nasa.gov/planetary/apod?api_key=DEMO_KEY&date=2017-08-03'),
  axios.get('https://api.nasa.gov/planetary/apod?api_key=DEMO_KEY&date=2017-08-02')
]).then(axios.spread((response1, response2) => {
  console.log(response1.data.url);
  console.log(response2.data.url);
})).catch(error => {
  console.log(error);
});

Sending Blob

const blob = new Blob(recordedChunks, { type: recordedChunks[0].type });
const data = new FormData();
data.append("file", blob);
const resp = await axios
  .post("/media", data, {
    headers: {
      "Content-Type": `multipart/form-data; boundary=${data._boundary}`
    },
    timeout: 30000
  })

Advanced Axios

Some random code I found to test out

const api = axios.create({
  baseURL: '/',
  headers: {
    'Content-Type': 'application/json'
  },
})

api.interceptors.request.use(
  config => {
    const token = localStorage.getItem('token')
    if (token) {
      config.headers['Authorization'] = `Token ${token}`
    }
    return config
  },
  error => Promise.reject(error)
)

Requests

Simplified version of python

const request = require('request');

request('https://api.nasa.gov/planetary/apod?api_key=DEMO_KEY', { json: true }, (err, res, body) => {
  if (err) { return console.log(err); }
  console.log(body.url);
  console.log(body.explanation);
});

Fetch

Builtin to modern browsers, adds parse step compared to axios and some other gotchas

fetch('./api/some.json')
  .then(
    function(response) {
      if (response.status !== 200) {
        console.log('Looks like there was a problem. Status Code: ' +
          response.status);
        return;
      }

      // Examine the text in the response
      response.json().then(function(data) {
        console.log(data);
      });
    }
  )
  .catch(function(err) {
    console.log('Fetch Error :-S', err);
  });

Response.status

.json()

.text()

Advanced Fetch

fetch(url, {
        method: "POST", // *GET, POST, PUT, DELETE, etc.
        mode: "cors", // no-cors, cors, *same-origin
        cache: "no-cache", // *default, no-cache, reload, force-cache, only-if-cached
        credentials: "same-origin", // include, *same-origin, omit
        headers: {
            "Content-Type": "application/json",
            // "Content-Type": "application/x-www-form-urlencoded",
        },
        redirect: "follow", // manual, *follow, error
        referrer: "no-referrer", // no-referrer, *client
        body: JSON.stringify(data), // body data type must match "Content-Type" header
    })
    .then(response => response.json());

Async await

const response = await fetch('https://api.com/values/1');
const json = await response.json();
console.log(json);

Creating URL Queries

function encodeQueryData(data) {
   const ret = [];
   for (let d in data)
     ret.push(encodeURIComponent(d) + '=' + encodeURIComponent(data[d]));
   return ret.join('&');
}

OG Fundamental

var http = new XMLHttpRequest();
http.open("GET", "url", true); //true if we want it to be synchronous
http.send();
http.onreadystatechange = function() {
  if(http.readyState == 4 && http.status == 200) {
    //...........
    //usually update DOM somehow
  }
}

Parse JSON Response

Could also send and receive XML, but nahhhhh JSON.parse(http.responseText); JSON.parse is only avaliable in most modern browsers, could use lib like jQuery

XMLHttpRequest States

• 0 request not initialized

• 1 request set up

• 2 request has been sent

• 3 request is in process

• 4 request is complete //essential

In JQuery

$.get("url", function(data) {
  .....
});