diff --git a/hc_spider/exc.py b/hc_spider/exc.py
new file mode 100644
index 0000000..d1a996c
--- /dev/null
+++ b/hc_spider/exc.py
@@ -0,0 +1,6 @@
+class AlreadyVisitedError(Exception):
+    pass
+
+
+class HTTPResponseError(Exception):
+    pass