Lua-http库写一个爬虫程序怎么样 ？

-- 导入所需的库
local http = require("http")
local json = require("json")

-- 定义爬虫IP服务器
local proxy = "http://your_proxy_server.com:port"

-- 定义要抓取的网站
local target_url = "https://www.snapchat.com"

-- 定义要抓取的页面和元素
local start_url = "https://www.snapchat.com/add"
local elements = {
    {"username", "/input[@name='username']/"},
    {"password", "/input[@name='password']/"},
    {"submit", "/button[@name='submit']/"}
}

-- 初始化爬虫
local function crawl()
    -- 使用爬虫IP服务器请求目标URL
    local response = http.request({
        url = target_url,
        method = "GET",
        headers = {
            ["Proxy-Authorization"] = "Basic dXNlcm5hbWU6cGFzc3dvcmQ=",
            ["User-Agent"] = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3"
        },
        ssl = {
            proxy = proxy,
            verify = not not proxy
        }
    })

    -- 检查响应状态
    if response.status == 200 then
        -- 解析HTML
        local html = response.read("*a")
        local document = json.decode(html)

        -- 遍历页面上的所有元素
        for _, element in ipairs(elements) do
            -- 提取元素的内容
            local content = document[element[2]].innertext

            -- 输出内容
            print(content)
        end
    else
        -- 输出错误信息
        print("Error: " .. response.status .. " " .. response.reason)
    end
end

-- 开始爬虫
crawl()