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func createInvoice() *gofpdf.Fpdf {
  pdf := gofpdf.New("P", "mm", "A4", "")
  pdf.AddPage()
  pdf.SetFont("Arial", "B", 16)
  pdf.Cell(40, 10, "Hello, world!")
  pdf.Cell(40, 10, "Привет, мир!")
  //_ = pdf.OutputFileAndClose("hello.pdf")
  return pdf
}

pdf := createInvoice()
  c.Response.Header().Set("Content-Type", "application/pdf")
  var b bytes.Buffer
  err = pdf.Output(&b)
  if err != nil {
    return err
  }
  pdf.Close()
  bytesPdf := b.Bytes()
  return c.Write(bytesPdf)