BOOL af_tcp_fastopen:1; /* delivery usefully used TCP Fast Open */
BOOL af_tcp_fastopen_data:1; /* delivery sent SMTP commands on TCP Fast Open */
BOOL af_pipelining:1; /* delivery used (traditional) pipelining */
BOOL af_tcp_fastopen:1; /* delivery usefully used TCP Fast Open */
BOOL af_tcp_fastopen_data:1; /* delivery sent SMTP commands on TCP Fast Open */
BOOL af_pipelining:1; /* delivery used (traditional) pipelining */