关于curl:curl-v-verbose

-v, –verbose

1. 以 ”>” 打头，示意申请头
2. 以 ”<“ 打头，示意响应头
3. 以 ”*” 打头，示意 curl 命令提供的额定信息。

• Makes the fetching more verbose/talkative. Mostly useful for debugging.
• A line starting with ‘>’ means “header data” sent by curl, ‘<‘ means “header data” received by curl that is hidden in normal cases, and a line starting with ‘*’ means additional info provided by curl.
• Note that if you only want HTTP headers in the output, -i, –include might be the option you’re looking for.
• If you think this option still doesn’t give you enough details, consider using –trace or –trace-ascii instead.
• This option overrides previous uses of –trace-ascii or –trace.
• Use -s, –silent to make curl quiet.