Support Spring 5?

[He-Pin]

Motivation:

I have to compile and change some code locally to make it works in streamable api.

public final class TmcpResponseHelper {
    public static boolean isBadRequest(final WebClientResponseException responseException) {
        return responseException.getRawStatusCode() == HttpStatus.BAD_REQUEST.value();
    }

    public static boolean isNotFound(ClientResponse response) {
        return response.rawStatusCode() == HttpStatus.NOT_FOUND.value();
    }

    public static boolean isNotAllowed(ClientResponse response) {
        return response.rawStatusCode() == HttpStatus.METHOD_NOT_ALLOWED.value();
    }


    @SuppressWarnings("deprecation")
    public static boolean is200(final ClientResponse response) {
        return response.rawStatusCode() >= 200 && response.rawStatusCode() < 300;
    }


}

delegate the status code check in WebClientStreamableHttpTransport