WebClientBuilder.kt

class ClientBuilder {
    private var failOnUnknownProperty: Boolean = false
    private var namingStrategy: PropertyNamingStrategy = PropertyNamingStrategy.LOWER_CAMEL_CASE
    private var headers: MutableMap<String, String> = mutableMapOf()
    private lateinit var baseUrl: String

    fun withFailOnUnknownProperty(failOnUnknown: Boolean): ClientBuilder {
        this.failOnUnknownProperty = failOnUnknown
        return this
    }

    fun withNamingStrategy(namingStrategy: PropertyNamingStrategy): ClientBuilder {
        this.namingStrategy = namingStrategy
        return this
    }

    fun withBaseUrl(baseUrl: String): ClientBuilder {
        this.baseUrl = baseUrl
        return this
    }

    fun withHeader(pair: Pair<String, String>) {
        this.headers[pair.first] = pair.second
    }

    fun build(): WebClient {
        val objectMapper = ObjectMapper().registerKotlinModule()
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
        objectMapper.propertyNamingStrategy = namingStrategy

        val exchangeStrategies: ExchangeStrategies = ExchangeStrategies.builder()
            .codecs { configurer ->
                configurer.defaultCodecs()
                    .jackson2JsonEncoder(Jackson2JsonEncoder(objectMapper, MediaType.APPLICATION_JSON))
                configurer.defaultCodecs()
                    .jackson2JsonDecoder(Jackson2JsonDecoder(objectMapper, MediaType.APPLICATION_JSON))
            }
            .build()

        return WebClient.builder()
            .baseUrl(baseUrl)
            .exchangeStrategies(exchangeStrategies)
            .build()
    }
}