Deftly handled, good sir.

If it happens against, things to try would be to ping the site and see if responds. If it doesn't, that means a site like Facebook is down momentarily, or, the server you happened to get put on shat itself while handling your request, and you'll have to reissue your request.

There's also the possibility that somebody like me, at one of the 10+ hops between you and everywhere else in the world, hit the "reset" button on something, say, the router you're talking through. That can cause dropped packets, for which some protocols (HTTP being one) don't handle well.