Improve CssLinkResourceTransformer to only update links to relative resources [SPR-11860]

[spring-projects-issues]

Rossen Stoyanchev opened SPR-11860 and commented

We should only update links that point to resources we serve. The CssLinkResourceTransformer should have a check that excludes links that are not relative -- i.e. either links that don't start with "/" or links that start with a scheme. The scheme could be as simple as looking for the first ":" and then ensuring the resulting substring does not contain any "/". This is very similar to a check added recently to StringUtils.cleanPath.

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Affects: 4.1 RC1

This issue is a sub-task of #16420

Issue Links:

• Enhance ResourceHttpRequestHandler with ResourceTransformer strategy [SPR-11800] #16420 Enhance ResourceHttpRequestHandler with ResourceTransformer strategy

Referenced from: commits 72baa9b