liquidjs/src/util/http.js

export function get (url) {
  return new Promise((resolve, reject) => {
    const xhr = new XMLHttpRequest()
    xhr.onload = () => {
      if (xhr.status >= 200 && xhr.status < 300) {
        resolve(xhr.responseText)
      } else {
        reject(new Error(xhr.statusText))
      }
    }
    xhr.onerror = () => {
      reject(new Error('An error occurred whilst sending the response.'))
    }
    xhr.open('GET', url)
    xhr.send()
  })
}