code: def serve_concatenated_pdf_from_memory(
          pdf_plans: Iterable[PdfPlan],
          start_recto: bool = True,
          offered_filename: str = "crate_download.pdf") -> HttpResponse:
      
      pdf = get_concatenated_pdf_in_memory(pdf_plans, start_recto=start_recto)
      return serve_buffer(pdf,
                          offered_filename=offered_filename,
                          content_type=MimeType.PDF,
                          as_attachment=False,
                          as_inline=True)
docs: Concatenates PDFs into memory and serves it.
      WATCH OUT: may not apply e.g. wkhtmltopdf options as you'd wish.