Post1_LogAppender.cs

public class ActionContextLogAppender : ILogAppender
{
    private readonly IActionContextAccessor actionContextAccessor;

    public ActionContextLogAppender(IActionContextAccessor actionContextAccessor)
    {
        this.actionContextAccessor = actionContextAccessor;
    }

    public void Append(IObjectWriter writer)
    {
        var actionContext = actionContextAccessor.ActionContext;
        var httpContext = actionContext.HttpContext;

        Guid requestId;

        if (httpContext.Items.TryGetValue(nameof(requestId), out var value) && value is Guid requestIdValue)
        {
            requestId = requestIdValue;
        }
        else
        {
            httpContext.Items[nameof(requestId)] = requestId = Guid.NewGuid();
        }

        writer.WriteObject("web", w => w
            .WriteProperty("requestId", requestId.ToString())
            .WriteProperty("requestPath", httpContext.Request.Path)
            .WriteProperty("requestMethod", httpContext.Request.Method)
            .WriteObject("routeValues", r =>
            {
                foreach (var kvp in actionContext.ActionDescriptor.RouteValues)
                {
                    r.WriteProperty(kvp.Key, kvp.Value);
                }
            }));
    }
}