public class SseHttpClientTransportAutoConfiguration { @Bean public List sseHttpClientTransports(...) {

    ......
        HttpClientSseClientTransport.Builder transportBuilder = HttpClientSseClientTransport.builder(baseUrl)
            .sseEndpoint(sseEndpoint)
            .clientBuilder(HttpClient.newBuilder())
            .objectMapper(objectMapper);
    ......
    }
    return sseTransports;
}

}

.clientBuilder(HttpClient.newBuilder())

SseHttpClientTransportAutoConfiguration needs to support custom injection of HttpClient.Builder to facilitate scenarios where SSL needs to be disabled