Spring webflux WebClient HttpStatus::is4xxServerError

[pavlomorozov]

Manual at https://docs.spring.io/spring/docs/5.0.9.RELEASE/spring-framework-reference/web-reactive.html#webflux-client mentions this example code line:

.onStatus(HttpStatus::is4xxServerError, response -> ...)

But problem is is4xxServerError method not exist. Most similar method I found is is4xxClientError. But as 4xx error status returns by server, not by client this method name seems strange. Any way manual not fit with code