Added getIP options

src/utils/getIP.js

@@ -2,5 +2,16 @@ var fs = require('fs');
 var config = require('../config.js');
 
 module.exports = function getIP(req) {
-  return config.behindProxy ? req.headers['x-forwarded-for'] : req.connection.remoteAddress;
+  if (config.behindProxy === true) config.behindProxy = "X-Forwarded-For";
+
+  switch (config.behindProxy) {
+    case "X-Forwarded-For":
+      return req.headers['X-Forwarded-For'];
+    case "Cloudflare":
+      return req.headers['CF-Connecting-IP'];
+    case "X-Real-IP":
+      return req.headers['X-Real-IP'];
+    default:
+      return req.connection.remoteAddress;
+  }
 }