Question

I am using a SMS web service, which sends me the replies to SMS via HTTP Post (i cant change this)

I catch the replies like this:

            string from = Request.QueryString["from"];
            string message = Request.QueryString["message"];
            string reference = Request.QueryString["ref"];                
            Database.DBLayer db = new Database.DBLayer(App_Code.ConfigClass.ConnectionString);
            db.InsertReply(Convert.ToInt32(reference), from, message);

But it seems to intermittently send me duplicates.. Is there a way of checking if the HTTP Request is a duplicate and if it is not actioning it?

Answer 1

You could hash the useful information in the response (e.g. the “from”, “message”, and “ref” concatenated together).

Use that as a unique constraint in your database.