axios: Configure the base path with interceptors

axios-set-base-path.js

var axios = require('axios');
var join = require('url-join');

// https://github.com/sindresorhus/is-absolute-url/blob/master/index.js#L7
var isAbsoluteURLRegex = /^(?:\w+:)\/\//;

axios.interceptors.request.use(function(config) {
  // Concatenate base path if not an absolute URL
  if ( !isAbsoluteURLRegex.test(config.url) ) {
    config.url = join('http://my-api.com', config.url);
  }

  return config;
});