SSL_read(s, buf, 16384) => 16384  (12 us)
SSL_read(s, buf, 16384) => -1  (5 us)
SSL_read(s, buf, 16384) => -1  (92 us)
SSL_read(s, buf, 16384) => 16384  (14 us)
...
SSL_read(s, buf, 16384) => 16384  (9 us)
SSL_read(s, buf, 16384) => -1  (5 us)
SSL_read(s, buf, 16384) => -1  (85 us)
SSL_read(s, buf, 16384) => 16384  (13 us)
...
SSL_read(s, buf, 16384) => 16384  (18 us)
SSL_read(s, buf, 16384) => -1  (75 us)
SSL_read(s, buf, 16384) => 16384  (24 us)