server { server_name ivr.com;             access_log /home/work/log/nginx/access.ivr.log; error_log /home/work/log/nginx/error.ivr.log; proxy_set_header Host $http_host; proxy_set_header X-Forwarded-Port $server_port; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_set_header X-Forwarded-Protocol $scheme; proxy_set_header X-Real-IP $remote_addr; proxy_read_timeout 30;  proxy_connect_timeout 10;  location /ivr/ { lua_code_cache off; resolver 8.8.8.8; set $backend '';  rewrite_by_lua_file /home/work/tengine-2.1.0/conf/lua/ivr.lua; proxy_pass http://$backend; } } 

local redis = require "resty.redis"local cjson = require "cjson"local cache = redis.new()cache.connect(cache, '127.0.0.1', '6379')local args = ngx.req.get_uri_args()local uri = ngx.var.request_urilocal callid = nillocal channel = 0if string.find(uri, 'yuntongxun') then callid = args["callid"] channel = 0elseif string.find(uri, 'yunhu') then ngx.req.read_body() local body_data = ngx.req.get_body_data() local data = cjson.decode(body_data) callid = data['call_id'] channel = 1elseif string.find(uri, 'huawei') then callid = args["vSessionsId"] channel = 2else endif callid == nil then ngx.say(uri) ngx.say(cjson.encode(args)) ngx.say('callid is empty') return ''endlocal key = callid .. '_channel' .. channellocal res = cache:get(key)if res == ngx.null then ngx.say("cache get error") return ''endngx.var.backend = res