diff --git a/src/main/java/com/tencent/msdk/dns/base/utils/HttpHelper.java b/src/main/java/com/tencent/msdk/dns/base/utils/HttpHelper.java
index dc938a6..675383d 100644
--- a/src/main/java/com/tencent/msdk/dns/base/utils/HttpHelper.java
+++ b/src/main/java/com/tencent/msdk/dns/base/utils/HttpHelper.java
@@ -31,7 +31,7 @@ public static String getRequest(String urlStr) {
             String host = url.getHost();
             String file = url.getFile();
             return GET_METHOD + ' ' + file + ' ' + HTTP_VERSION + CRLF +
-                    "Connection: close" + CRLF +
+                    "Connection: keep-alive" + CRLF +
                     HOST_HEADER + ": " + host + CRLF +
                     CRLF;
         } catch (MalformedURLException e) {