SSL connection issue

Questions & Help Questions
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3

Tried erlang strings already, don’t work at all, throwing errors (whereas elixir strings and tuples are silently accepted):

... , ciphers: ['TLS_RSA_WITH_AES_128_GCM_SHA256']
# ->
{:error,
 %HTTPoison.Error{id: nil,
  reason: {:options, {:ciphers, ['TLS-RSA-WITH-AES-128-GCM-SHA256']}}}}

...
{:error,
 %HTTPoison.Error{id: nil,
  reason: {:options, {:ciphers, ['TLS_RSA_WITH_AES_128_GCM_SHA256']}}}}

(atoms, just in case, throw the same error)