如何从发送给NodeMCU的lua的http请求中获取post参数

-- 发送HTTP请求
http.post("http://example.com/api", "Content-Type: application/x-www-form-urlencoded\r\n", "param1=value1&param2=value2", function(code, data)
  if (code == 200) then
    print("HTTP request successful")
    print("Response data: " .. data)
  else
    print("HTTP request failed")
  end
end)

-- 创建HTTP服务器
http.server(80, function(req, res)
  -- 解析HTTP请求的内容
  local method, path, vars = http.server.parse(req)
  
  -- 获取POST参数
  local postParams = vars.post
  
  -- 处理POST参数
  if postParams then
    for key, value in pairs(postParams) do
      print("POST parameter: " .. key .. " = " .. value)
    end
  end
  
  -- 发送HTTP响应
  res:send("HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\nHello, NodeMCU!")
end)