Quote:
Originally Posted by j.p.s
It's sort of a poor (or ignorant in a kind sense) person's outgoing firewall. All packets going to that the IP address for that hostname will go to your computer instead. This may or may not be benign. For HTTP, it probably will not do any harm.
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Doing this became popular in the mid to late 1990s. It was frowned upon and discouraged by some because of the potential delays and other problems, notably timeouts. But in practice, it often sped up web browsing because doubleclick's servers were frequently overloaded. I remember staring at wait cursors for long periods, giving up and clicking cancel, only to have pretty much the entire page rendered instantly. The browser was waiting for the image from doubleclick to arrive before rendering anything at all.