**A little background:** 
My app is built on Polymer 2.x and is being hosted on a server that does not support HTTP/2 and does not have a certificate for HTTPS. We must support IE11, Chrome, Firefox, and Safari.

**Problem:**
I'm running into an issue with browser caching. I was hoping to use the service worker that the Polymer CLI generates to handle the cache busting. However, since our client's server doesn't have HTTPS enabled, we are unable to utilize it. Regardless, we have to support IE 11 on a single build, so service workers aren't an option.

I cannot figure out a way to bust the cache on new deployments. On the Polymer CLI github page, there is an open issue regarding this topic, but there hasn't been any traction since 2016. From watching the YouTube videos on Polymer, it looks like there is (or used to be) a way to intercept the build using Gulp, but I can't seem to figure it out.

Any help is greatly appreciated!