diff --git a/apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/spi/defaultimpl/DefaultSsoHeartbeatHandler.java b/apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/spi/defaultimpl/DefaultSsoHeartbeatHandler.java
index 0324d85f3cf96e4fb0b62431f27876b4df36c782..31613516c3230600f2237db37cc42ee7efeacdda 100644
--- a/apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/spi/defaultimpl/DefaultSsoHeartbeatHandler.java
+++ b/apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/spi/defaultimpl/DefaultSsoHeartbeatHandler.java
@@ -14,6 +14,7 @@ public class DefaultSsoHeartbeatHandler implements SsoHeartbeatHandler {
   @Override
   public void doHeartbeat(HttpServletRequest request, HttpServletResponse response) {
     try {
+      response.setContentType("text/plain;charset=utf-8");
       response.getWriter().write("default sso heartbeat handler");
     } catch (IOException e) {
     }