verbose logging output

[ZeeD]

Context

I would like to ease the troubleshooting of http request made by urllib3.
It is used under-the-hood by the library I'm using, and, currently, during development, I'm not able to double check if the requests/response are correct (with the appropriate origin, path, all the headers/cookie etc)

Alternatives

Ideally I want to be able to set some global flag / env variable that could tell urllib3 to be more verbose and produce an output like curl -v.

Duplicate

I cannot find any reference to this feature
The only reference I've found is in the user guide but it refer to a way to disable the (already too much thin) logs, not to enhance them.

Contribution

I'm not sure I'm capable but I may try to offer a PR for this feature.