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-rw-r--r--mitmproxy/net/check.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/mitmproxy/net/check.py b/mitmproxy/net/check.py
index aaea851f..a19ad6fe 100644
--- a/mitmproxy/net/check.py
+++ b/mitmproxy/net/check.py
@@ -2,7 +2,7 @@ import ipaddress
import re
# Allow underscore in host name
-_label_valid = re.compile(b"(?!-)[A-Z\d\-_]{1,63}(?<!-)$", re.IGNORECASE)
+_label_valid = re.compile(br"(?!-)[A-Z\d\-_]{1,63}(?<!-)$", re.IGNORECASE)
def is_valid_host(host: bytes) -> bool: