refactor

@@ -61,7 +61,7 @@ public class HttpClient {
                 try {
                     httpClient = this.buildHttpClient();
                 } catch (Exception e) {
-                    log.warn("build http client fail {}", e.getMessage());
+                    log.warn("build http client fail, {}", e.getMessage());
                 }
                 try {
                     Thread.sleep(3 * 1000);