CSV columns don't seem to be documented

[Joshfindit]

Even just a line at the top of the output would be fine:

HTTP Version,HTTP return status,Seconds,Size,Path,??,DateTime
HTTP/1.1,200,  0.90,  18753,/,0,2020-04-30 14:35:29

[Jaernbrand]

Probably to late to be useful for you, but someone else might be wondering the same thing. The question mark column is the URL ID.

Each URL are assigned an ID, which is just an incrementing integer. If the --internet flag is set then the URLs are randomly chosen at runtime and that affects the URL ID displayed.