Failed to register for BoringSSL log debug updates
问题 When debugging app in Xcode 9 beta while it's running on iPhone with iOS 11 beta installed, I started to notice following messages when performing networking calls: [] network_config_register_boringssl_log_debug_updates Failed to register for BoringSSL log debug updates [BoringSSL] Function boringssl_context_get_peer_npn_data: line 1212 Peer's advertised NPN data is NULL or empty Any idea what is causing this? 回答1: Open the Xcode Scheme editor and add a new environment variable OS_ACTIVITY