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use Base64.strict_encode64 which does not add line feeds every few characters.
see https://ruby-doc.org/stdlib-2.2.0/libdoc/base64/rdoc/Base64.html#method-i-strict_encode64
::strict_encode64 also uses the same #pack logic
as rack-test does inside its #basic_authorize method.
see https://github.com/rack-test/rack-test/blob/72fc72dc15bfd33f45bc13cd134fb5e2c04dbe1e/lib/rack/test.rb#L166
more: https://glaucocustodio.github.io/2014/09/27/a-reminder-about-base64encode64-in-ruby/