diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java b/mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java
index 1a6e47e2..98fdf309 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java
@@ -271,6 +271,9 @@ public class AppMaster {
                     httpURLConnection = (HttpURLConnection) url.openConnection();
                     httpURLConnection.setConnectTimeout(15000);
                     httpURLConnection.setReadTimeout(15000);
+                    
+                    httpURLConnection.setRequestProperty("Content-Type", "application/json");
+
                     try {
                         httpURLConnection.setRequestMethod("POST");
                     } catch (Exception ex) {