class Acme::Client::HTTPClient::AcmeMiddleware

def call(env)
  @env = env
  @env[:request_headers]['Content-Type'] = CONTENT_TYPE
  if @env.method != :get
    @env.body = client.jwk.jws(header: jws_header, payload: env.body)
  end
  @app.call(env).on_complete { |response_env| on_complete(response_env) }
end