diff --git a/src/main/java/act/xio/NetworkHandler.java b/src/main/java/act/xio/NetworkHandler.java
index <HASH>..<HASH> 100644
--- a/src/main/java/act/xio/NetworkHandler.java
+++ b/src/main/java/act/xio/NetworkHandler.java
@@ -159,7 +159,7 @@ public class NetworkHandler extends DestroyableBase implements  $.Func1<ActionCo
         @Override
         public String apply(H.Request req, String url) throws NotAppliedException, Osgl.Break {
             int sz = url.length();
-            if (sz < 5) {
+            if (sz < 4) {
                 return url;
             }
             int start = sz - 1;
fix issue: /csv caused <I>