After upgrading to Elixir 1.10.3, a call to HTTPoison.request!() raised a HTTPoison.Error with id: nil and a reason of {:options, {:sslv3, {:versions, [:"tlsv1.2", :"tlsv1.1", :tlsv1, :sslv3]}}}. What could cause this? All examples I've seen online assume the reason is an atom.
sslv3 was removed from Erlang 23.0 because it is an old and insecure protocol. You need to upgrade hackney to 1.16.0 or higher so that you can get this PR that fixes that issue: