ktor-client-core/io.ktor.client/HttpClientConfig/engine

engine

fun engine(block: T.() -> Unit)

A builder for configuring engine-specific settings in HttpClientEngineConfig, such as dispatcher, thread count, proxy, and more.

val client = HttpClient(CIO) { // HttpClientConfig<CIOEngineConfig>
    engine { // CIOEngineConfig.() -> Unit
        proxy = ProxyBuilder.http("proxy.example.com", 8080)
    }
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You can learn more from Engines.