Suppose I have one javascript file that I have been distributing to a large number of my clients, similar to GA * ga.js, and this file is downloaded quite a high number of times when I have to put it on a CDN.
The problem with this setting is that it is very difficult to “generate” a new version of javascript. Ideally, when I have a new version of JS, I would like to split the incoming traffic on a CDN and send 1% of all traffic to a new JS (randomly selected), or maybe send a new JS only for specific URLs.
I came across this problem several times and did not come up with a good solution. One possible solution is to work with CDN, although this is a lengthy process. An alternative solution is that clients always download a javascript loader that knows where the actual JS or phased JS is located, and accordingly breaks the traffic.
I am curious if there are any alternative solutions that people have come up with. This is a fairly common problem for any company that distributes its JS, such as Google, Twitter, Facebook, Linkedin, etc.
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