index.js

import axios from 'axios'
import interceptors from './interceptors'
import baseConfig from '../config'

/**
 * Cria instância do axios para as requisições ajax
 */
export const http = axios.create({
  baseURL: baseConfig.fullAPIPath,
  headers: {'content-type': 'application/json'}
})

/**
 * Método auxiliar para setar o token no header do axios
 */
export function setToken (token) {
  http.defaults.headers.common.Authorization = `Bearer ${token}`
}

// receive store and data by options
export default function install (Vue, {router}) {
  interceptors(http, router)
  Object.defineProperty(Vue.prototype, '$http', {
    get () {
      return http
    }
  })
}

interceptors.js

import { isArray } from 'lodash'

/**
 * Interceptador de requisições com erro
 */
export default (http, router) => {
  // https://github.com/mzabriskie/axios#interceptors
  http.interceptors.response.use(
    response => response,
    /**
     * This is a central point to handle all
     * error messages generated by HTTP
     * requests
     */
    (error) => {
      const { response } = error
      /**
       * If token is either expired, not provided or invalid
       * then redirect to login. On server side the error
       * messages can be changed on app/Providers/EventServiceProvider.php
       */
      if ([401, 403].indexOf(response.status) > -1) {
        console.log('autenticação')
        router.push({ name: 'auth' })
      }
      /**
       * Error messages are sent in arrays
       */
      if (isArray(response.data)) {
        console.log(response.data)
        /**
         * Laravel generated validation errors are
         * sent in an object
         */
      } else {
        console.log(response.data)
      }

      return Promise.reject(error)
    }
  )
}