Re: [whatwg/fetch] Document how new protocols relate to port blocking (#1106)

@martinthomson approved this pull request.

I don't know what level of detail you are looking for.  This is certainly on the light side, but this is a good thing to say.

> @@ -2190,6 +2190,9 @@ given <var>request</var>, run these steps:
 
 <h3 id=port-blocking>Port blocking</h3>
 
+<p class=note>New protocols can avoid the need for blocking ports by negotiating the protocol
+through TLS. The protocol cannot be spoofed through HTTP requests in that case.

I might cite RFC 7301 here.

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