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-rw-r--r--mitmproxy/net/websockets/frame.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/mitmproxy/net/websockets/frame.py b/mitmproxy/net/websockets/frame.py
index ac6a0812..7b93bc24 100644
--- a/mitmproxy/net/websockets/frame.py
+++ b/mitmproxy/net/websockets/frame.py
@@ -71,7 +71,7 @@ class FrameHeader:
else:
self.length_code = length_code
- if mask is DEFAULT and masking_key is DEFAULT:
+ if (mask is DEFAULT and masking_key is DEFAULT) or mask == 0 or mask is False:
self.mask = False
self.masking_key = b""
elif mask is DEFAULT: