client, public EnvironmentsClientBuilder pipeline(HttpPipeline pipeline) {

[weidongxu-microsoft]

Azure/azure-sdk-for-java#31300 (comment)

for pipeline and httpClient we should update this to copy what the hand-written builders do with logging a debug message if the HttpPipeline, or HttpClient, is set to null after being configured as there is a chance that it is a bug in user code:

if (this.pipeline != null && pipeline == null) {
    logger.info("HttpPipeline is being set to 'null' when it was previously configured.");
}