how to log badrequest in web api 2? - exception

Question

Is there a way to catch and log badrequest or unauthorized response code from an action in web api 2?
I tried adding onactionexecuted attributefilter and ExceptionLogger but neither of them worked.
public IHttpActionResult ConfirmUpload(string val)
{
if (String.IsNullOrWhiteSpace(val))
return BadRequest(val);
}
public static void Register(HttpConfiguration config)
{
AreaRegistration.RegisterAllAreas();
config.Filters.Add(new ErrorLogAttribute());
config.Services.Add(typeof(IExceptionLogger), new ErrorLogger());
}
Any help is appreciated.

Answer 1

To log bad requests you can write your own LogAttribute derived from ExceptionFilterAttribute
public class LogAttribute : ExceptionFilterAttribute
{
public override void OnException(HttpActionExecutedContext context)
{
Log.Error(context.Exception);
context.Response = context.Request.CreateResponse(
HttpStatusCode.InternalServerError,
new { message = context.Exception.InnerException != null ? context.Exception.InnerException.Message : context.Exception.Message });
base.OnException(context);
}
}
HttpActionExecutedContext contains information about request so you can check request status, if you need. Attribute can be applied to controller, action
public class ValueController : ApiController
{
[Log]
public IEnumerable<object> Get()
{
}
}
or added globally
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
config.Filters.Add(new LogAttribute());
}
}
also all exceptions could be catched in global.asax
protected void Application_Error()
{
var ex = Server.GetLastError().GetBaseException();
// ignore 404
if (!(ex is HttpException && ((HttpException)ex).GetHttpCode() == 404))
{
Log.Fatal("Unhandled error catched in Global.asax", ex);
}
Server.ClearError();
}