gistfile1.ex

def fetch(url, {:basic, auth}) do
    [username, password] = String.split(auth, ":")
    request = HTTPotion.get(url, [basic_auth: {username, password}])
    request.body
end

def fetch(url, {:digest, auth}) do
    digest_request = Porcelain.shell("curl --max-time 15 --digest --user '#{auth}' #{url}")
    digest_request.out
end

def fetch(url, {:cookie, auth}) do
    ...
end