grape_logging/lib/grape_logging/loggers/request_headers.rb

module GrapeLogging
  module Loggers
    class RequestHeaders < GrapeLogging::Loggers::Base
      HTTP_PREFIX = 'HTTP_'.freeze

      def parameters(request, _)
        headers = {}

        request.env.each_pair do |k, v|
          next unless k.to_s.start_with? HTTP_PREFIX

          k = k[5..-1].split('_').each(&:capitalize!).join('-')
          headers[k] = v
        end

        { headers: headers }
      end
    end
  end
end