diff --git a/nginx.conf.template b/nginx.conf.template
index 44f84de..102510e 100644
--- a/nginx.conf.template
+++ b/nginx.conf.template
@@ -24,13 +24,12 @@ server {
 
     location /UP {
         access_by_lua_block{
+            local json = require("cjson")
             ngx.req.read_body()
             local req = ngx.req.get_body_data()
-            local newreq, n, err = ngx.re.gsub(req, '\\\\', '\\\\')
-            local newreq, n, err = ngx.re.gsub(newreq, '"', '\\"')
-            local newreq, n, err = ngx.re.gsub(newreq, "^", "{\"message\":\"")
-            local newreq, n, err = ngx.re.gsub(newreq, "$", "\"}")
-            ngx.req.set_body_data(newreq)
+            local newreq = { ["message"] = req }
+            local body = json.encode(newreq)
+            ngx.req.set_body_data(body)
         }
 
         proxy_set_header  Content-Type application/json;