1 files changed, 6 insertions, 8 deletions
diff --git a/examples/simple/io_write_dumpfile.py b/examples/simple/io_write_dumpfile.py
index 311950af..cf7c4f52 100644
--- a/examples/simple/io_write_dumpfile.py
+++ b/examples/simple/io_write_dumpfile.py
@@ -7,23 +7,21 @@ to multiple files in parallel.
 """
 import random
 import sys
-from mitmproxy import io
+from mitmproxy import io, http
+import typing  # noqa
 
 
 class Writer:
-    def __init__(self, path):
+    def __init__(self, path: str) -> None:
         if path == "-":
-            f = sys.stdout
+            f = sys.stdout  # type: typing.IO[typing.Any]
         else:
             f = open(path, "wb")
         self.w = io.FlowWriter(f)
 
-    def response(self, flow):
+    def response(self, flow: http.HTTPFlow) -> None:
         if random.choice([True, False]):
             self.w.add(flow)
 
 
-def start(opts):
-    if len(sys.argv) != 2:
-        raise ValueError('Usage: -s "flowriter.py filename"')
-    return Writer(sys.argv[1])
+addons = [Writer(sys.argv[1])]