为了识别第二种pinning：在tcp_stream的event callback中，若接收字节数为0，调用ssl_stream_process_zero_eof。

platform/include/internal/platform.h

@@ -48,6 +48,7 @@ struct tfe_conn_private
 	struct bufferevent * bev;
 	struct ev_token_bucket_cfg * ratelimit_bucket;
 	uint8_t on_writing;
+	size_t total_rx_bytes, total_tx_bytes;
 };
 
 enum tfe_stream_event_log_type

platform/include/internal/ssl_stream_core.h

@@ -24,6 +24,7 @@ struct ssl_mgr * ssl_manager_init(const char * ini_profile, const char * section
 void ssl_manager_set_new_upstream_cb(struct ssl_mgr * mgr, ssl_stream_new_hook* new_upstream_cb, void* u_para);
 void ssl_manager_destroy(struct ssl_mgr * mgr);
 unsigned long ssl_stream_log_error(struct bufferevent * bev, enum tfe_conn_dir dir, struct ssl_mgr* mgr);
+void ssl_stream_process_zero_eof(struct ssl_stream * s_stream, struct ssl_mgr* mgr);
 
 
 enum ssl_stream_action ssl_upstream_create_result_release_action(future_result_t * result);