JavaScript标记的src属性会在所有浏览器中遵循HTTP重定向吗？ [英] Will JavaScript tag's src attribute follow HTTP redirects in all browsers

问题描述

比方说，javascript标记的src属性指向一个重定向：

 < script src =http：// foo.com/foo.js\"></script> 
  

其中 http://foo.com/foo.js 是一个301重定向到 https：// foo.com/foo.js ...

所有的浏览器能否成功加载JS文件？我注意到它似乎可以在Chrome，Firefox，Safari和IE9中运行......但是我只是好奇它是一种规范还是随机的...

这里唯一要注意的是浏览器发出两个请求来下载一个资源&前提是脚本调用在浏览器中被阻止，所以不建议长时间使用此策略。我们使用301的3个非常基本的原因是：

1. 美化网址


2. 确保链接权益


3. 解决规范问题。

Let's say, a javascript tag's src attribute points to a redirect:

<script src="http://foo.com/foo.js"></script>

where http://foo.com/foo.js is a 301 redirect to https://foo.com/foo.js...

Will all browsers successfully load the JS file? I've noticed it seems to work in Chrome, Firefox, Safari, and IE9... but I'm just curious if this is something that's in a spec or just random...

解决方案

Loading resources for a webpage (be it script source, image source or whatever) is agnostic to how browser fetches it for you (using HTTP protocol over TCP/IP).

The only thing to be aware of here is that browser makes two request to download one resource & provided that script calls are blocking in browser, so it is not advised to use this strategy for long. For the 3 very basic reason we use 301s are:

1. Prettify URLs
2. Ensure Link equity
3. Resolve canonical issue.

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