Adding the current web request URL to your log4net logging context

log-examples.txt

2012-10-04 17:25:25,241 DEBUG [|24] Dovetail.SDK.Bootstrap.Clarify.CurrentSDKUser / Setting the current user to be annie 
2012-10-04 17:25:25,246 DEBUG [annie|24] Dovetail.SDK.Bootstrap.Clarify.ClarifySessionCache / Get session for annie. Found valid session in cache. 
2012-10-04 17:25:39,695 DEBUG [|28] Dovetail.SDK.Bootstrap.Clarify.ClarifySessionCache /api/history/case/148 Getting application session. 
2012-10-04 17:25:39,695 DEBUG [|28] Dovetail.SDK.Bootstrap.Clarify.ClarifySessionCache /api/history/case/148 Get session for sa. Found valid session in cache. 
2012-10-04 17:25:39,695 DEBUG [|28] Dovetail.SDK.Bootstrap.Clarify.ClarifySessionCache /api/history/case/148 Get session for annie. Found valid session in cache. 
2012-10-04 17:25:39,696 DEBUG [|28] Dovetail.SDK.Bootstrap.Authentication.PrincipalFactory /api/history/case/148 Creating principal for user annie with 165 permissions. 
2012-10-04 17:25:39,696 DEBUG [|28] Dovetail.SDK.Bootstrap.Clarify.CurrentSDKUser /api/history/case/148 Setting the current user to be annie 

log4net.config.xml

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <log4net>
    <appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
      <param name="File" value="../logs/bootstrap.log" />
      <param name="AppendToFile" value="true" />
      <param name="RollingStyle" value="Size" />
      <param name="MaxSizeRollBackups" value="15" />
      <param name="MaximumFileSize" value="10MB" />
      <param name="StaticLogFileName" value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date %-5level [%identity|%thread] %logger %ndc %message %newline" />
      </layout>
    </appender>
    <root>
      <level value="DEBUG" />
      <appender-ref ref="RollingFileAppender" />
    </root>
  </log4net> 
</configuration>

log4net.push.cs

var url = HttpContext.Current.Request.Path

using(log4net.ThreadContext.Stacks["NDC"].Push(url))
{
    log.Info("Time to log the information.");
}

/* 

The resulting log output might look something like:

2012-10-04 17:23:44,818 INFO /controller/view/id - Time to log the information.

*/

logrequestcontext.cs

public class LogRequestContextModule : IHttpModule
{
	private ILogger _logger;
	private IDisposable _logContext;

	public void Init(HttpApplication context)
	{
		context.BeginRequest += (sender, args) =>
		{
			_logger = ObjectFactory.GetInstance<ILogger>();

			var url = HttpContext.Current.Request.Path;

			_logContext = _logger.Push(url); //equivalent to return log4net.NDC.Push(context);

		};

		context.EndRequest += (sender, args) => Dispose();
	}

	public void Dispose()
	{
		if (_logContext == null) return;

		_logContext.Dispose();
		_logContext = null;
	}
}

web.config.xml

<configuration>
...
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true">
      ...
      <add name="LogRequest" type="Dovetail.SDK.Bootstrap.Configuration.LogRequestContextModule, Dovetail.SDK.Bootstrap" />
      ...
    </modules>
  </system.webServer>
...
<configuration>

In async methods that use ConfigureAwait(false), request URL is (null).