diff --git a/webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java b/webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java
index 0fd770d..d62130b 100644
--- a/webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java
+++ b/webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java
@@ -408,9 +408,7 @@ public class Spider implements Runnable, Task {
     protected void processRequest(Request request) {
         Page page = downloader.download(request, this);
         if (page == null) {
-            sleep(site.getRetrySleepTime());
-            onError(request);
-            return;
+            throw new RuntimeException("unaccpetable response status");
         }
         // for cycle retry
         if (page.isNeedCycleRetry()) {