Escape semi colons in directive source lists#419
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This was referenced Jan 21, 2020
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Reported in #418 by @mvgijssel we allow semicolons in directive source list values. The semicolons act as delimiters in CSP leading to undesired and possibly malicious behavior.
I think this is a harmless way of addressing the issue but I've added a deprecation warning indicating it will break with the next release.