i have a problem status lua 200 not showing

i made some script like below.

default.conf

location /proxy {

    proxy_pass http://127.0.0.1:8001/;
    rewrite_by_lua_file ./lua/set_by_file.lua;
    }    

######### lua/set_by_file.lua
local pretty = require "resty.prettycjson"

        function getval(v, def)
        if v == nil then
                return def
        end
                return v
        end

        local data = {request={}, response={}}

        local req = data["request"]
        local resp = data["response"]
        req["host"] = ngx.var.host
        req["uri"] = ngx.var.uri
        req["headers"] = ngx.req.get_headers()
        req["time"] = ngx.req.start_time()
        req["method"] = ngx.req.get_method()
        req["get_args"] = ngx.req.get_uri_args()

        req["body"] = ngx.var.request_body

        content_type = getval(ngx.var.CONTENT_TYPE, "")


        resp["headers"] = ngx.resp.get_headers()
        resp["status"] = ngx.status
        resp["duration"] = ngx.var.upstream_response_time
        resp["time"] = ngx.now()
        resp["body"] = ngx.var.response_body

        local hasilnya = pretty({data})



		local redis = require "resty.redis"
                local red = redis:new()

                red:set_timeout(1000) -- 1 sec

                -- or connect to a unix domain socket file listened
                -- by a redis server:
                --     local ok, err = red:connect("unix:/path/to/redis.sock")

                local ok, err = red:connect("127.0.0.1", 6379)
                if not ok then
                    ngx.say("failed to connect: ", err)
                    return
                end

                ok, err = red:set("dog", pretty({data}))
                if not ok then
                    ngx.say("failed to set dog: ", err)
                    return
                end

                ngx.say("set result: ", ok)

result

"[\n\t{\n\t\t\"request\": {\n\t\t\t\"host\": \"localhost\",\n\t\t\t\"method\": \"GET\",\n\t\t\t\"uri\": \"\\/proxy\",\n\t\t\t\"time\": 1536133125.225,\n\t\t\t\"get_args\": \t\t\t{},\n\t\t\t\"headers\": {\n\t\t\t\t\"host\": \"localhost\",\n\t\t\t\t\"accept\": \"*\\/*\",\n\t\t\t\t\"user-agent\": \"curl\\/7.47.0\"\n\t\t\t}\n\t\t},\n\t\t\"response\": {\n\t\t\t\"status\": 0,\n\t\t\t\"time\": 1536133125.225,\n\t\t\t\"headers\": {\n\t\t\t\t\"connection\": \"keep-alive\"\n\t\t\t}\n\t\t}\n\t}\n]"

But, i have a problem with the response status. I got "0" status as a result. It should be "200" for the normal response. Do you have any suggestions for this issue?

The issue provides an nginx configuration and Lua script using ngx.status, ngx.resp.get_headers(), and resty.redis, and reports a response status of 0 instead of 200. Start by reproducing the configuration and checking when the response status is available; the issue does not define a repository change or a clear completion condition.