This is such a stupid bug. I swear I checked this exact piece of code for
this exact bug and it wasn't there. But after I fixed it, I had no problem
running a download for 11 hours straight.
This fix won't affect a case where the firewall is actually closing long-
running connections (which is bad behavior, but it could happen) or a case
where the Internet is just flakey and the connection drops.
But it will fix the most common case where both client and server are on
robust connections and the download times out anyway.
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