Re: [whatwg/fetch] Allow connection reuse for request without credentials when TLS client auth is not in use (#341)

We reuse connections basically whenever we consider it advantageous to do so.  If someone were to observe our networking stack, they might conclude that connections are dropped seemingly randomly.  In reality, complicated heuristics are used to determine when to keep a connection open based on how long it's been unused, how many of various resources we have left, etc.  It is unfortunate that this leaks some information across domains.  Work is also currently being done to leak less such information.  We should work towards a better solution in the long term, but it will be especially hard without compromising performance too much.

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