Add tracing to Apache HttpClient engine

[howareyouman]

Subsystem
Engine for HttpClient - ApacheEngine

Is your feature request related to a problem? Please describe.
It seems like it's not possible to create HttpClient with Apache engine with Tracing component inside.

Describe the solution you'd like
It will be nice to construct HttpClient with custom implementation of HttpAsyncClientBuilder inside and use tracing feature implicitly.

Motivation to include to ktor
All api with clientBuilder is internal and there is no way to override it without support of ktor client.

[e5l]

Hi @howareyouman, thanks for the report.
Do you have an idea of how it should look?

[howareyouman]

@e5l Smth like this:
HttpClient(Apache) { engine { setTracing(tracing) } }

[oleg-larshin]

Please check the following ticket on YouTrack for follow-ups to this issue. GitHub issues will be closed in the coming weeks.

[Stexxe]

You can customize an instance of HttpAsyncClientBuilder with the following code:

HttpClient(Apache) {
    engine {
        customizeClient { // this: HttpAsyncClientBuilder

        }
    }
}

But it doesn't have the setTracing method.