instance method s3_http_headers_for_direct_upload

# File activestorage/lib/active_storage/service/s3_service.rb, line 154
      def s3_http_headers_for_direct_upload(digest_and_checksum)
        return {} unless digest_and_checksum

        # If in format "algorithm:checksum", extract each part
        if digest_and_checksum.include?(":")
          algorithm, checksum = digest_and_checksum.split(":")
          { "x-amz-checksum-#{algorithm}" => checksum }
        else
          # No prefix means MD5
          { "Content-MD5" => digest_and_checksum }
        end
      end