完善https代理相关的处理.

Signed-off-by: Jack <jack.wgm@gmail.com>
改善example的实现.

Signed-off-by: Jack <jack.wgm@gmail.com>
flush 标准输出, 避免尾部数据未输出到控制台.

Signed-off-by: Jack <jack.wgm@gmail.com>