why isn't nlog saving a bad request url? - asp.net-mvc

Question

I use ASP.NET Core and NLog.Web.AspNetCore (4.3.1). NLog isn't saving a bad request url - why?
That is mine NLog.config:
<?xml version="1.0" encoding="utf-8"?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<targets>
<target name="logfile" xsi:type="File" fileName="${basedir}/nlog.txt"
layout="${longdate} url: ${aspnet-request-url} | ${message}"/>
</targets>
<rules>
<logger name="*" minlevel="Warn" writeTo="logfile"/>
</rules>
</nlog>
When I have a 404 error nlog is saving:
2017-05-11 20:07:34.2466 url: | My error message
Url above is empty - why?
My Configure method in Startup.cs:
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
loggerFactory.AddConsole(Configuration.GetSection("Logging"));
loggerFactory.AddDebug();
// .....
app.UseExceptionHandler("/Error/ApplicationError");
app.UseStatusCodePagesWithReExecute("/Error/Error/{0}");
// .....
loggerFactory.AddNLog();
app.AddNLogWeb();
// ......
}
My Error controller:
public class ErrorController : Controller
{
private readonly ILogger<ErrorController> _logger;
public ErrorController(ILogger<ErrorController> logger)
{
_logger = logger;
}
public IActionResult ApplicationError()
{
return View();
}
[Route("/Error/Error/{statusCode}")]
public IActionResult Error(int statusCode)
{
_logger.LogError("My error message");
return View(statusCode);
}
}

Answer 1

Try adding the AspnetCore extensions to your NLog configuration:
<?xml version="1.0" encoding="utf-8"?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<extensions>
<add assembly="NLog.Web.AspNetCore"/>
</extensions>
...
</nlog>
See the NLog AspnetCore documentation for more info.