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cdnbro

v1.1.1

Published

fallback for cdn assets

Downloads

6

Vulnerabilities

Powered byPowered by Snyk
  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

bubenshchykovbubenshchykov

Keywords

cdnfallbackloaderscripts

Readme

Build Status js-standard-style

Why

  • cdn constantly fails, especially cloudfront
  • when cdn fails, each asset blocks an execution for 30 sec
  • so user gets 90 sec of white screen if you load 3 assets one by one
  • we would like to have smaller time out for cdn

Solution

  • load assets asynchronously
  • if cdn times out - load fallback
  • mark cdn as failed for 1 day and use fallback sources during that

Example

<html>
<head>
	<script>
	window.cdnbro(
		[
			"//dcamghsjgsjl6.cloudfront.net/css/app-aa76b5fb4e.css",
			"//dcamghsjgsjl6.cloudfront.net/libs-07b7cfb48a.js",
			"//dcamghsjgsjl6.cloudfront.net/scripts-7c0c10b50f.js"],
		[
			"/css/app-nocdn-724e4424e4.css",
			"/libs-07b7cfb48a.js",
			"/scripts-7c0c10b50f.js"], 10000);
	</script>
</head>
<body>
	<div class="spinner"></div>
</body>
</html>

Tech

  • assets loaded by xhr to control the order and timeouts
  • so scripts should have cors enabled, like cloudfront has
  • browser support: ie9+, all recent desktop and mobile