Extract SSL certificate from the hackney request

get_cert.erl

#! /usr/bin/escript

-include_lib("hackney/include/hackney.hrl").
-include_lib("public_key/include/public_key.hrl").

main([]) ->
    ok = hackney:start(),
    {ok, 200, _, C} = hackney:request(get, <<"https://friendpaste.com">>, [], <<>>, []),
    {ok, Cert} = ssl:peercert(C#client.socket),
    DecodedCert = public_key:pkix_decode_cert(Cert, plain),
    io:format("Certificate: ~p~n", [DecodedCert]),
    ok.