Can I Log all requests using Flurl.Http?

Question

Asp.NET core logs each request that enters based on configuration. Now i'd like to have the same functionality for Flurl requests i sent. Most notably, I of course would like to know when a requests fails or does not complete. For debugging I found logging all requests in a verbose matter was extremely helpful.

Answer 1

Sure can. For cross-cutting concerns like logging, you want to use Flurl's event handlers, specifically BeforeCall, AfterCall, and OnError. Here's an error logging example:

private async Task HandleFlurlErrorAsync(HttpCall call) 
{
    await LogErrorAsync(call.Exception.Message);
    call.ExceptionHandled = true; // prevents exception from bubbling up, if desired
}

// Configure globally:
FlurlHttp.Clients.WithDefaults(builder =>
    builder.BeforeCall(HandleFlurlErrorAsync));

The above example registers the handler for all Flurl calls when the clientless pattern is used. There are other options, such as configuring for a specific client or request, or registering it with your DI container. See the docs for more details.