Intercept all WebApi calls before the route matching occurs

Question

I am looking for a way to intercept/grab the request being made before matching to a route. For example, I have multiple controllers and routes set up, but I want some mecha

Answer 1

I'm using mentioned technique to log all requests and responses. Speaking shortly, the best way to do it is to use Handlers.

First, create handler:

public class CustomHandler : DelegatingHandler
{
    protected override async Task SendAsync(
        HttpRequestMessage request, CancellationToken cancellationToken)
    {
        //get route values and process them
        var routeValues = (IHttpRouteData[]) HttpContext.Current.Request.RequestContext.RouteData.Values["MS_SubRoutes"];

        //let other handlers process the request
        return await base.SendAsync(request, cancellationToken)
            .ContinueWith(task =>
            {
                //once response is ready, do something with it                                        

                return task.Result;
            }, cancellationToken);
    }
}

Then, register it in WebApiConfig:

config.MessageHandlers.Add(new CustomHandler());