loader post data fix

haxework/net/BaseURLLoader.hx

@@ -1,5 +1,6 @@
 package haxework.net;
 
+import flash.net.URLVariables;
 import flash.events.ProgressEvent;
 import haxework.net.ILoader.Method;
 import flash.net.URLLoaderDataFormat;
@@ -22,6 +23,14 @@ class BaseURLLoader<T> extends BaseLoader<T> {
   override private function internalRequest(url:String):Void {
     loader = buildLoader();
     var request:URLRequest = new URLRequest(url);
+    request.method = Std.string(method);
+    if (data != null && method == Method.POST) {
+      var variables:URLVariables = new URLVariables();
+      for (key in Reflect.fields(data)) {
+        Reflect.setField(variables, key, Reflect.field(data, key));
+      }
+      request.data = variables;
+    }
     loader.load(request);
   }
 

haxework/net/callback/Callback.hx

@@ -4,6 +4,10 @@ import haxe.Timer;
 
 class Callback<T> implements ICallback<T> {
 
+  public static function build<T>():ICallback<T> {
+    return new Callback<T>();
+  }
+
   private var _success:Null<T -> Void>;
   private var _fail:Null<Dynamic -> Void>;