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    <p>If you are using IIS 7 you could take a look at the <a href="http://learn.iis.net/page.aspx/548/using-dynamic-ip-restrictions/" rel="noreferrer">Dynamic IP Restrictions Extension</a>. Another possibility is to implement this as an action filter:</p> <pre><code>[AttributeUsage(AttributeTargets.Method, AllowMultiple = false)] public class RateLimitAttribute : ActionFilterAttribute { public int Seconds { get; set; } public override void OnActionExecuting(ActionExecutingContext filterContext) { // Using the IP Address here as part of the key but you could modify // and use the username if you are going to limit only authenticated users // filterContext.HttpContext.User.Identity.Name var key = string.Format("{0}-{1}-{2}", filterContext.ActionDescriptor.ControllerDescriptor.ControllerName, filterContext.ActionDescriptor.ActionName, filterContext.HttpContext.Request.UserHostAddress ); var allowExecute = false; if (HttpRuntime.Cache[key] == null) { HttpRuntime.Cache.Add(key, true, null, DateTime.Now.AddSeconds(Seconds), Cache.NoSlidingExpiration, CacheItemPriority.Low, null); allowExecute = true; } if (!allowExecute) { filterContext.Result = new ContentResult { Content = string.Format("You can call this every {0} seconds", Seconds) }; filterContext.HttpContext.Response.StatusCode = (int)HttpStatusCode.Conflict; } } } </code></pre> <p>And then decorate the action that needs to be limited:</p> <pre><code>[RateLimit(Seconds = 10)] public ActionResult Index() { return View(); } </code></pre>
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