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-rw-r--r--mitmproxy/proxy/protocol/tls.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/mitmproxy/proxy/protocol/tls.py b/mitmproxy/proxy/protocol/tls.py
index 1cb9b3c2..82c9d096 100644
--- a/mitmproxy/proxy/protocol/tls.py
+++ b/mitmproxy/proxy/protocol/tls.py
@@ -503,7 +503,7 @@ class TlsLayer(base.Layer):
if alpn and b"h2" in alpn and not self.config.options.http2:
alpn.remove(b"h2")
- if self.client_conn.ssl_established:
+ if self.client_conn.ssl_established and self.client_conn.connection.get_alpn_proto_negotiated():
# If the client has already negotiated an ALP, then force the
# server to use the same. This can only happen if the host gets
# changed after the initial connection was established. E.g.: