lua-web-utils and proxy setup example

The following is a downloader program using lua-web-utils and proxy:

-- First install the lua-web-utils library
local lwu = require "lwu"
​
-- Get server
local function get_proxy()
    local proxy_url = "duoipget_proxy"
    local resp, code, headers, err = lwu.fetch(proxy_url)
    if err then
        print("Acquisition failed:", err)
        return nil
    end
    local json = light . json_decode ( resp ) ;
    if not json then
        print("Unable to parse server response")
        return nil
    end
    return json.proxy
end
​
--Downloaded content
local function download__com(proxy)
    local url = "com"
    local opts = {
        proxy = proxy,
        headers = {
            ["User-Agent"] = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36",
        },
    }
    local resp, code, headers, err = lwu.fetch(url, opts)
    if err then
        print("Download failed:", err)
        return nil
    end
    local content = light . json_decode ( resp ) ;
    if not content then
        print("Unable to parse download content")
        return nil
    end
    return content
end
​
-- main function
local function main()
    local proxy = get_proxy()
    if not proxy then
        return
    end
    local content = download_com(proxy)
    if content then
        print("Download successful:", content)
    end
end
​
-- Run the main function
main()

This program first uses lwu.fetch()the function to get the server from duoipcnproxy. Then, use the content downloaded from the server.