How to get the API error message

[Renrhaf]

Hi !

When working with this API, I'm facing difficulties getting the Sendinblue API error message.

	result, resp, err := sib.TransactionalEmailsApi.SendTransacEmail(ctx, sendinblueMail)
	if err != nil {
		log.Println("Error when calling TransactionalEmailsApi->SendTransacEmail:", err.Error())
		return c.Status(resp.StatusCode).SendString(err.Error())
	}

I'm only getting the generic error message :
2023/05/26 09:42:05 Error when calling TransactionalEmailsApi->SendTransacEmail: 400 Bad Request

When I want to get the specific message like :

{
  "code": "invalid_parameter",
  "message": "File extension mismatch in 'url' & 'name' passed in the request"
}

How to get that from the err variable, since the response object body has already been read and closed, we can not extract it again.
Thank you

[manjurulhoque]

You can do that by following below code:

(not able to paste the code)