The actual code that adds the header is in Net::HTTP::Methods, at line 180 in the current version.

    if ($self->keep_alive) {
        if ($peer_ver eq "1.0") {
            # from looking at Netscape's headers
            push(@h2, "Keep-Alive: 300");
            unshift(@connection, "Keep-Alive");
        }
    }

[download]

So, I would guess that Net::HTTP believes your connection is http/1.0, and is therefore sending the http/1.0 header. If it's not, maybe you can make a bug report against the module?

In reply to Re^3: How to remove HTTP Keep-Alive 300 header from LWP::UserAgent request by jeffenstein
in thread How to remove HTTP Keep-Alive 300 header from LWP::UserAgent request by Veltro

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