Avoid persisting data when refreshing

Regardless of language, the solution to the question is to be solved only with request information sent by the browser. In this case we will use chrome and firefox , as they both add a new header when the user gives refresh or f5 , this header is Cache-Control with a value of max-age 0 .

Implementation in ASP.NET MVC

public ActionResult Index()
{
    var cacheControl = Request.Headers["Cache-Control"];

    if (cacheControl != null) // opcional o 'Equals("max-age=0")'
    {
        // "É refresh"
    } else {
        // Pode salvar o log
    }
    // restante do código
}

internet explorer adds a parameter to the request depending on the version, it is up to you to see which one you want to span and adapt that solution.