Custom Http Handler Example

CandidateSignatureHandler.cs

 public class CandidateSignatureHandler : IHttpHandler
    {
        public bool IsReusable
        {
            get { return false; }
        }

        public void ProcessRequest(HttpContext context)
        {
            ICandidateDocument _candidateDocHandler = AppDefaults.Get<ICandidateDocument>();
            var routeValues = context.Request.RequestContext.RouteData.Values;
            if (routeValues.ContainsKey("id"))
            {
                var id = Convert.ToInt64(routeValues["id"]);
                var signature = _candidateDocHandler.SignatureImage(id);
                context.Response.Clear();
                //Response type will be the same as the one requested
                context.Response.ContentType = "image/png";
                //We buffer the data to send back until it's done
                context.Response.BufferOutput = true;
                if (String.IsNullOrEmpty(signature))
                {
                    context.Response.End();
                    return;
                }
                signature = signature.Replace("data:image/png;base64,", String.Empty);
                byte[] imageBytes = Convert.FromBase64String(signature);
                Image image;
                using (MemoryStream ms = new MemoryStream(imageBytes))
                {
                    image = Image.FromStream(ms);
                }
                image.Save(context.Response.OutputStream, ImageFormat.Png);
                context.Response.End();
            }
        }
    }

HttpHandlerConfig.cs

 public static class HttpHandlerConfig
    {
        public static void Config(RouteCollection routes)
        {
            routes.Add("CandidateSignatureRoute", new Route("candidate/signature/{id}", new HttpHandlerRouteHandler<CandidateSignatureHandler>()));
        }
    }

HttpHandlerRouteHandler.cs

    public class HttpHandlerRouteHandler<THandler>
     : IRouteHandler where THandler : IHttpHandler, new()
    {
        public IHttpHandler GetHttpHandler(RequestContext requestContext)
        {
            return new THandler();
        }
    }