code: def fost_hmac_request_signature(
      secret, method, path, timestamp, headers = {}, body = ''):
      
      signed_headers, header_values = 'X-FOST-Headers', []
      for header, value in headers.items():
          signed_headers += ' ' + header
          header_values.append(value)
      return fost_hmac_request_signature_with_headers(
          secret, method, path, timestamp,
          [signed_headers] + header_values, body)
docs: Calculate the signature for the given secret and arguments.