diff --git a/assets/php/index.php b/assets/php/index.php
index 50ca2c4..5783df0 100644
--- a/assets/php/index.php
+++ b/assets/php/index.php
@@ -28,6 +28,10 @@ if (strpos($_SERVER['HTTP_USER_AGENT'], "php-httpproxy/") !== 0 && strpos($_SERV
     exit('<!DOCTYPE html><html><head><title>It works!</title><meta charset="utf-8"></head><body><h1>It works!</h1><p><a href="https://github.com/gnh1201/caterpillar">Download the client</a></p><p>' . DEFAULT_USER_AGENT . '</p></body></html>');
 }
 
+function jsonrpc2_cast_to_array($data) {
+    return is_array($data) ? $data : array($data);
+}
+
 function jsonrpc2_encode($method, $params, $id = '') {
     $data = array(
         "jsonrpc" => "2.0",
@@ -431,7 +435,7 @@ function relay_fetch_url($params) {
         
         // check it is POST request
         if ($data == "POST") {
-            curl_setopt($ch, CURLOPT_POSTFIELDS, array($data));
+            curl_setopt($ch, CURLOPT_POSTFIELDS, jsonrpc2_cast_to_array($data));
             curl_setopt($ch, CURLOPT_POST, true);
         }
 
@@ -492,7 +496,26 @@ function relay_get_geolocation() {
 
 function relay_invoke_method($params) {
     $callback = $params['callback'];
-    $args = (is_array($params['args']) ? $params['args'] : array());
+    $requires = jsonrpc2_cast_to_array($params['requires']);
+    $args = jsonrpc2_cast_to_array($params['args']);
+
+    foreach($requires as $required_url) {
+        try {
+            $result = relay_fetch_url($required_url);
+            if ($result['success']) {
+                $fh = tmpfile();
+                if ($fh !== false) {
+                    fwrite($fh, $result['data']);
+                    $path = stream_get_meta_data($fh)['uri'];
+                    @require($path);
+                    fclose($fh);
+                    @unlink($path);
+                }
+            }
+        } catch (Exception $e) {
+            // ignore an exception
+        }
+    }
 
     try {
         $data = call_user_func_array($callback, $args);
diff --git a/console.html b/console.html
index 047340a..783daf5 100644
--- a/console.html
+++ b/console.html
@@ -251,21 +251,36 @@
                         var k = (args.length > 0 ? args[0] : '');
                         var v = (args.length > 1 ? args.slice(1) : []).join(' ');
 
+                        // "env" is the reserved word
                         if (k == "env") {
                             this.echo("env is the reserved word");
                             return;
                         }
                         
+                        // check a variable is it Array
+                        if (k in env && env[k] instanceof Array) {
+                            env[k].push(v);
+                            return;
+                        }
+                        
                         // method(relay_web_search)
                         if (env.method == "relay_web_search" && k == "page") {
                             env[k] = parseInt(v);
                             return;
                         }
+                        
 
                         env[k] = v || null;
 
                         if (k == "method") {
                             this.set_prompt('method([[b;red;black]' + env.method + '])> ');
+                            
+                            // method(relay_invoke_method)
+                            if (env.method == "relay_invoke_method") {
+                                set_default_env({
+                                    "requires": []
+                                });
+                            }
 
                             // method(relay_sendmail)
                             if (env.method == "relay_sendmail") {
@@ -323,6 +338,7 @@
 
                             jsonrpc2_request(this, env.method, {
                                 "callback": args[0],
+                                "requires": env.requires,
                                 "args": args.slice(1)
                             });
                             return;
