Log Request

[altmank]

How do you enable logging of the request body that Refit sends?

[JeremyBP]

You can use HttpTracer as a DelegatingHandler or maybe Apizr to get a lot more features

[glennawatson]

Refit has no built-in request logging. Logging is the job of the HttpClient pipeline, so add a DelegatingHandler that logs the request (and body) and plug it in.

Minimal handler:

class LoggingHandler : DelegatingHandler
{
    protected override async Task<HttpResponseMessage> SendAsync(
        HttpRequestMessage request, CancellationToken ct)
    {
        if (request.Content != null)
        {
            var body = await request.Content.ReadAsStringAsync(ct);
            Console.WriteLine($"{request.Method} {request.RequestUri}\n{body}");
        }
        return await base.SendAsync(request, ct);
    }
}

Wire it up with HttpClientFactory:

services.AddRefitClient<IMyApi>()
    .ConfigureHttpClient(c => c.BaseAddress = new Uri("https://api.example.com"))
    .AddHttpMessageHandler(() => new LoggingHandler());

Or without DI:

var client = new HttpClient(new LoggingHandler { InnerHandler = new HttpClientHandler() })
{
    BaseAddress = new Uri("https://api.example.com")
};
var api = RestService.For<IMyApi>(client);

Prebuilt options if you do not want to roll your own: HttpTracer or Apizr (as suggested above) both work as the DelegatingHandler.