Better customization options for the underlying HTTP client

We're using the CF Java client under a fairly high load (tens of thousands of requests per day) and we would like to enable the metrics feature of reactor-netty, so that we can see how many connections are used at any point in time:

return createHttpClient().compress(true) // Code taken from _DefaultConnectionContext.java
            .tcpConfiguration(this::configureTcpClient)
            .secure(this::configureSsl)
            .metrics(true, new CustomHttpClientMetricsRecorder());

This is currently not possible unless we also override the entire reactor-netty client via DefaultConnectionContext.builder().httpClient(...), which we don't want to do, because it would involve to copy-pasting the entire HttpClient building logic from _DefaultConnectionContext. I could make a pull request that allows users of the CF Java client to do:

DefaultConnectionContext.builder()
    .metrics(true) // OR
    .metrics(true, new CustomHttpClientMetricsRecorder())
    .build();

But I also don't particularly like that idea, because this doesn't cover any future features that the rector-netty devs may implement (or already have implemented). Maybe something like the following would be best?

DefaultConnectionContext.builder()
    .additionalHttpClientConfiguration(httpClient -> httpClient.metrics(true) // OR
        .metrics(true, new CustomHttpClientMetricsRecorder()))
    .build();

What do you think?

Leggi _DefaultConnectionContext e il punto di ingresso DefaultConnectionContext.builder per capire come viene assemblato il reactor-netty HttpClient. Confronta le opzioni di metriche proposte con l’hook additionalHttpClientConfiguration, quindi individua i test esistenti per la costruzione del client; il lavoro è completato quando i chiamanti possono personalizzare il client sottostante senza sostituire l’intera logica di costruzione.