my $ua = Mojo::UserAgent->new();
$ua->transactor->name( $useragent );
my $tx = $ua->build_tx( GET => $url );
my $str = $tx->req->to_string;
say $str;

#GET /videoplayback?... HTTP/1.1
#Content-Length: 0
#User-Agent: Mozilla/5.0
#Accept-Encoding: gzip
#Host: hostname.com