I met with exactly the same problem. Changing line 103 of SOAP/Transport/HTTP2.pm to below can fix the symptom.

  $self->request(HTTP::Request->new(
    $r->method() => $r->uri,
    HTTP::Headers->new(%$r->headers_in),
    do { my ($c,$buf); while ($r->read($buf,$cl)) { $c.=$buf; } $c; }
  ));

[download]
looks like a bug.

In reply to Re^2: SOAP::Lite incompatible usage of HTTP::Headers by Ross_flyingcat
in thread SOAP::Lite incompatible usage of HTTP::Headers by inzoik

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