class HTTP::Request

def webmock_signature
  request_body = nil
  if defined?(HTTP::Request::Body)
    request_body = String.new
    first_chunk_encoding = nil
    body.each do |part|
      request_body << part
      first_chunk_encoding ||= part.encoding
    end
    request_body.force_encoding(first_chunk_encoding) if first_chunk_encoding
    request_body
  else
    request_body = body
  end
  ::WebMock::RequestSignature.new(verb, uri.to_s, {
    headers: headers.to_h,
    body: request_body
  })
end