# File lib/oauth/request_proxy/base.rb, line 138
    def header_params
      %w( X-HTTP_AUTHORIZATION Authorization HTTP_AUTHORIZATION ).each do |header|
        next unless request.env.include?(header)

        header = request.env[header]
        next unless header[0,6] == 'OAuth '

        # parse the header into a Hash
        oauth_params = OAuth::Helper.parse_header(header)

        # remove non-OAuth parameters
        oauth_params.reject! { |k,v| k !~ /^oauth_/ }

        return oauth_params
      end

      return {}
    end