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Domain Fronting, Vulnerabilities and Detection

I'm considering the possibility of detecting attempted domain fronting in MWG. It should be simple enough; just look for a "Host" header and detect if it fails to match URL.Host. The rest of the design decisions will be how to log it (which I don't really need help with). But, I thought I'd ask, just in case obvious assumptions don't apply, whether MWG as direct proxy would be vulnerable to such malicious activity. It seems to me that in this function MWG would normally ignore the "Host" header. Am I right, or am I making a bad assumption?
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