# File lib/mu/http_helper.rb, line 110
  def post_json(e, json, p = {})
     url = "https://#{@username}:#{@password}@#{@host}#{@docroot}#{e}"
     msg "#{url}  #{json}", Logger::DEBUG
     params = { :content_type => "application/json" }.merge! p
     params[:cookies] = $cookie if !$cookie.empty?
     resp = RestClient.post(url, json, params  )
     begin
      msg resp, Logger::DEBUG
      $cookie = resp.cookies unless resp.cookies.empty?
      msg "got cookie #{$cookie}", Logger::DEBUG unless resp.cookies.empty?
      jresp = JSON resp
      if jresp
        return jresp
      end
    rescue JSON::ParserError => e
       # msg e, Logger::DEBUG
    end
    return resp
  end