Log every request to web api method to file - asp.net-mvc

Question

My requirements are to add logging to every request and response and errors to a file. I have tried this,
public class LogRequestAndResponseHandler : DelegatingHandler
{
private static readonly ILog Log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
protected override async Task<HttpResponseMessage> SendAsync(
HttpRequestMessage request, CancellationToken cancellationToken)
{
// log request body
string requestBody = await request.Content.ReadAsStringAsync();
Log.Info(requestBody);
// let other handlers process the request
var result = await base.SendAsync(request, cancellationToken);
if (result.Content != null)
{
// once response body is ready, log it
var responseBody = await result.Content.ReadAsStringAsync();
Log.Info(responseBody);
}
return result;
}
}
Added this it to WebApiConfig of MVC5 as following,
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
// Web API configuration and services
log4net.Config.XmlConfigurator.Configure();
config.MessageHandlers.Add(new LogRequestAndResponseHandler());
// Web API routes
config.MapHttpAttributeRoutes();
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);
}
}
Web config has this section,
<log4net>
<!-- file appender -->
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="C:/logs/my_log_file.log"/>
<appendToFile value="true"/>
<rollingStyle value="Date"/>
<maxSizeRollBackups value="30"/>
<datePattern value=".yyyy-MM-dd"/>
<staticLogFileName value="true"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline"/>
</layout>
</appender>
<root>
<level value="DEBUG"/>
<appender-ref ref="RollingFileAppender"/>
</root>
</log4net>
Nothing is being added to file and there are no errors, is there anything I am doing wrong, it creates the file but no logging ever ?