Internal change

PiperOrigin-RevId: 542865099

quiche/quic/core/quic_flags_list.h

diff --git a/quiche/quic/core/quic_flags_list.h b/quiche/quic/core/quic_flags_list.h
index cf8fe39..778269f 100644
--- a/quiche/quic/core/quic_flags_list.h
+++ b/quiche/quic/core/quic_flags_list.h
@@ -58,7 +58,7 @@
 // If true, include stream information in idle timeout connection close detail.
 QUIC_FLAG(quic_reloadable_flag_quic_add_stream_info_to_idle_close_detail, true)
 // If true, reject or send error response code upon receiving invalid request or response headers.
-QUIC_FLAG(quic_reloadable_flag_quic_act_upon_invalid_header, false)
+QUIC_FLAG(quic_reloadable_flag_quic_act_upon_invalid_header, true)
 // If true, remove the non-initial burst in QUIC PacingSender.
 QUIC_FLAG(quic_reloadable_flag_quic_pacing_remove_non_initial_burst, false)
 // If true, require handshake confirmation for QUIC connections, functionally disabling 0-rtt handshakes.