adjust log format

weed/server/common.go

@@ -69,7 +69,7 @@ func writeJson(w http.ResponseWriter, r *http.Request, httpStatus int, obj inter
 // wrapper for writeJson - just logs errors
 func writeJsonQuiet(w http.ResponseWriter, r *http.Request, httpStatus int, obj interface{}) {
 	if err := writeJson(w, r, httpStatus, obj); err != nil {
-		glog.V(0).Infof("error writing JSON %s status %d: %v", obj, httpStatus, err)
+		glog.V(0).Infof("error writing JSON %+v status %d: %v", obj, httpStatus, err)
 	}
 }
 func writeJsonError(w http.ResponseWriter, r *http.Request, httpStatus int, err error) {