Add custom HTTP headers support

[didil]

@jimaek is this something we can start working on ? using the curl format for example ?

[jimaek]

-X or --header "Key: value" something like this?

[MartinKolarik]

--header, -H (same as curl)

[didil]

yes I think in curl it's -H or --header https://stackoverflow.com/questions/356705/how-to-send-a-header-using-a-http-request-through-a-curl-call#answer-356714