Re: [whatwg/fetch] Consider adding SMB to port blacklist (#544)

This seems like a reasonable thing to explore. I can add some metrics to Chrome. @zackw: Would you mind filing a bug at https://crbug.com/ so I remember to follow up on Monday?

I think, though, that we should consider splitting the bad ports list into those that we can block completely, and those that we can block iff the top-level browsing context doesn't match. 9100, for instance, looks like it's going to be a bit too widely used for us to block entirely, but might be blockable as a subresource request from the rest of the web (which would at least make the scanning mechanism described above a little harder to implement).

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