class Seahorse::Client::Http::AsyncResponse

def signal_headers(headers)
  # H2 headers arrive as array of pair
  hash = headers.inject({}) do |h, pair|
    key, value = pair
    h[key] = value
    h
  end
  @status_code = hash[":status"].to_i
  @headers = Headers.new(hash)
  emit(:headers, @status_code, @headers)
end