ngx_ssl_free_session  711 src/http/ngx_http_upstream_round_robin.c         ngx_ssl_free_session(ssl_session);
ngx_ssl_free_session  825 src/http/ngx_http_upstream_round_robin.c         ngx_ssl_free_session(old_ssl_session);
ngx_ssl_free_session  584 src/stream/ngx_stream_upstream_round_robin.c         ngx_ssl_free_session(ssl_session);
ngx_ssl_free_session  698 src/stream/ngx_stream_upstream_round_robin.c         ngx_ssl_free_session(old_ssl_session);