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    GET /path/to/file.ext HTTP/1.1
    TE: deflate,gzip;q=0.3
...
    Host: my.domain.com
    If-Modified-Since: Wed, 07 Jun 2017 03:40:39 GMT
    User-Agent: File::Fetch/0.48

    $ decode_base64("YW5vbnltb3VzOkZpbGUtRmV0Y2hAZXhhbXBsZS5jb20=")
    anonymous:File-Fetch@example.com

    if ($self->userinfo) {
        $uri->userinfo($self->userinfo);
    } elsif ($self->scheme ne 'file') {
        $uri->userinfo("anonymous:$FROM_EMAIL");
    }