Switching to and from HTTP to HTTPS causes rebuilds

[tomjn]

Excessive rebuilds can be triggered by mixing or swapping http and https URLs in LESS variables

E.g. visiting

http://example.com
https://example.com
http://example.com

Will trigger rebuilds despite no file or variable changes

[lkraav]

Yes, I also discovered that dynamics in the stylesheet will cause this side effect. I was building background header image logic into LESS mixins where less_vars filter was substituting the background image url and then discovered every page load caused a rebuild.

If you're just switching protocols, you should do protocol-relative // anyway. But if anything about the request URL changes, you will get a rebuild.

In my mind, if this can even be considered a bug, wp-less caching system should make filenames also hash-based.

[tomjn]

#63 Now contains fixes for this. It changes the cache and css build files to contain the protocol in their filename. This means moving from one to the other will generate a worst case scenario of 2 builds, rather than indefinite rebuilding per page load. It also bypasses the issue of changing http to https and vice versa and which URLs to apply it to