It's immutable in the sense that `<script src="https://assets.myapp.com/apps/1.0.2/main.js">` https://assets.myapp.com/apps/1.0.2/main.js">` will always load th

It's immutable in the sense that `<script src="https://assets.myapp.com/apps/1.0.2/main.js">` https://assets.myapp.com/apps/1.0.2/main.js">` will always load the same resource whenever the page is loaded (especially if it's cached indefinitely). Where as `<script src="./main.js">` could potentially load different versions of `main.js` depending on the release version.