curl -v, --verbose

-v, --verbose

1. 以">"打头，表示请求头
2. 以"<"打头，表示响应头
3. 以"*"打头，表示curl命令提供的额外信息。

• 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.