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Correction: HTTP/1.0 doesn't have Host headers at all, while HTTP/1.1 requires them. It's one of the easiest ways to distinguish the two versions. Host headers

Correction: HTTP/1.0 doesn't have Host headers at all, while HTTP/1.1 requires them. It's one of the easiest ways to distinguish the two versions. Host headers enable virtual hosts (multiple domains on one IP), letting the Internet grow to billions of domains without requiring an IP for each of them.

marvy 10y ago
Neat! I thought host was optional, I didn't realize it didn't exist at all.
fanf2 10y ago
Host headers were widely deployed before HTTP/1.1 - IIRC MS IE 3 was the first version to support Host: in 1996 - Netscape supported it earlier.