diff --git a/test/fuzzing/go_proxy b/test/fuzzing/go_proxy
index 1e6bbaeff..5960d081e 100755
--- a/test/fuzzing/go_proxy
+++ b/test/fuzzing/go_proxy
@@ -3,7 +3,7 @@
 #   mitmproxy/mitmdump is running on port 8080 in straight proxy mode.
 #   pathod is running on port 9999
 
-BASE="/Users/aldo/git/public/pathod/venv/bin/pathoc -eo -I 200,400,502 -p 8080 localhost "
-$BASE -n 1000 "get:'http://localhost:9999':ir,@1"
+BASE="/Users/aldo/git/public/pathod/venv/bin/pathoc -eo -I 200,400,405,502 -p 8080 localhost "
+$BASE -n 10000 "get:'http://localhost:9999':ir,@1"
 
 
diff --git a/test/test_fuzzing.py b/test/test_fuzzing.py
index 4b4253d87..857a2b102 100644
--- a/test/test_fuzzing.py
+++ b/test/test_fuzzing.py
@@ -1,7 +1,8 @@
 import tservers
 
 """
-    A collection of errors turned up by fuzzing. 
+    A collection of errors turned up by fuzzing. Errors are integrated here
+    after being fixed to check for regressions.
 """
 
 class TestFuzzy(tservers.HTTPProxTest):
@@ -10,3 +11,17 @@ class TestFuzzy(tservers.HTTPProxTest):
         p = self.pathoc()
         assert p.request(req%self.server.port).status_code == 400
 
+    def test_nullbytes(self):
+        req = r'get:"http://localhost:%s":i19,"\x00"'
+        p = self.pathoc()
+        assert p.request(req%self.server.port).status_code == 400
+
+    def test_invalid_ports(self):
+        req = 'get:"http://localhost:999999"'
+        p = self.pathoc()
+        assert p.request(req).status_code == 400
+
+    def test_invalid_ipv6_url(self):
+        req = 'get:"http://localhost:%s":i13,"["'
+        p = self.pathoc()
+        assert p.request(req%self.server.port).status_code == 400