Re: CFWriteStreamWrite Blocking if we give invalid Host.

[Jens Alfke]

Looks like you're using the stream in synchronous mode, since you haven't added it to a runloop. In that case, I'm pretty sure that the DNS lookup and socket opening are done synchronously, too. That explains the delay you're seeing. The "-1" return value only indicates that the socket's write buffer can't accept any bytes; you haven't even gotten to that point yet because the socket isn't open.

—Jens

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