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Editorial Team
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Asked: 2026-05-17T21:28:16+00:00

The main difference between HTTP/1.0 and HTTP/1.1 is that HTTP/1.1 has a mandatory Host

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The main difference between HTTP/1.0 and HTTP/1.1 is that HTTP/1.1 has a mandatory Host header in it (source: HTTP Pocket Reference – O’reilly).

So, why is that Wget, which uses the HTTP/1.0 protocol, has a host header in it?

My output of Wget with netcat:

GET / HTTP/1.0
User-Agent: Wget/1.12 (linux-gnu)
Accept: */*
Host: 127.0.0.1:10101
Connection: Keep-Alive

As it is clear that Wget uses the HTTP/1.0 protocol version, how can it have a host header in it? Or am I getting somewhere wrong with my understanding of HTTP protocol?

And even if HTTP/1.0 can has Host Header in its HTTP request, what can be the reason behind wget using HTTP/1.0 protocol while HTTP/1.1 can also be used in place of that?

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1 Answer

  1. Editorial Team

    The Host header was added as an “optional” addition to HTTP/1.0 very early on when it was realized this was the only way to allow one server to serve up pages for multiple domains. wget uses HTTP/1.0 with Host as the way to be compatible with the maximum number of sites, some of which don’t respond to HTTP/1.1 even though they require Host.

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