通过lua将nginx请求状态码转变为自定义状态码

        思路：在nginx请求的header_filter_by_lua阶段，将请求状态码修改为自定义状态码
    

直接上代码,将以下代码写入配置文件xxx.lua,在相对应的域名下引用就可以了:
header_filter_by_lua_file "xxx.lua";

        local log_time = os.date("%Y-%m-%d %X",os.time())
local ngx_lua_ua_log = "/data/nginx/log/sec.lua.log"
local status = ngx.var.status

local user_agent = ngx.var.http_user_agent
local host = ngx.var.host

local function add_quote(str)
    return string.format(‘"%s"‘, str)
end

local function logging(log_file, msg)
    file = io.open(log_file, "a+")
    file:write(msg)
    file:flush()
    file.close()
end

if user_agent == "xxx" and ngx.status ~= 200 then
    ngx.status = "211"
    local msg = table.concat({
        add_quote(log_time),
        add_quote(host),
        add_quote(user_agent),
        add_quote(ngx.status),
        "n"
    }, " ")
    logging(ngx_lua_ua_log, msg)
else
    return
end
    

经过测试，所有以xxx的user-agent且状态码不为200的请求都修改为了”211“，具体情况，可以自己修改；

原文：https://blog.51cto.com/wenxi123/2716098