How to log HttpClient requests in Kentico Kontent .NET Delivery Client?

How do you log the HTTP Requests that the Kentico Kontent .NET delivery API here: https://github.com/Kentico/kontent-delivery-sdk-net

Specifically what I am looking for is how to log the HTTP Get requests to delivery.kentico.ai (the end point that you retrieve your content JSON from).

Solution

You can enrich and inject an HttpClient to the DeliveryClient.

Enrich:

    public class LoggingHandler : DelegatingHandler
    {
        public LoggingHandler(HttpMessageHandler innerHandler, Microsoft.Extensions.Logging.ILogger logger)
            : base(innerHandler)
        {
            Logger = logger;
        }

        public Microsoft.Extensions.Logging.ILogger Logger { get; }

        protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
        {
            Logger.LogInformation(request.Method + " " + request.RequestUri);

            HttpResponseMessage response = await base.SendAsync(request, cancellationToken);

            Logger.LogInformation(response.StatusCode + " " + response.Content.Headers);
            return response;
        }
    }

Use e.g. Serilog

        services.AddLogging(builder =>
        {
            // Add Serilog
            builder.AddSerilog(new LoggerConfiguration()
                    .MinimumLevel.Information()
                    .WriteTo.File("logs\\log.log", rollingInterval: RollingInterval.Day)
                    .CreateLogger());
        });

        var serviceProvider = services.BuildServiceProvider();
        var logger = serviceProvider.GetRequiredService<ILogger<Startup>>();

        HttpClient httpClient = new HttpClient(new LoggingHandler(new HttpClientHandler(), logger));

        var deliveryOptions = new DeliveryOptions();
        Configuration.GetSection(nameof(DeliveryOptions)).Bind(deliveryOptions);

Inject:

        var deliveryClient = DeliveryClientBuilder
            .WithOptions(_ => deliveryOptions)
            .WithHttpClient(httpClient)
            .Build();

Additional resources: