check for 4xx Http Code with native Java

I'm actually utilizing javax.ws.rs.core.Response.Status.Family now. Thank you @Kon for the useful hint!

import javax.ws.rs.core.Response.Status.Family;

if (Family.familyOf(responseCode) == Family.CLIENT_ERROR) {

If using Spring you can simply do :

    HttpStatus.valueOf(statusCode).is4xxClientError()

You can also look at is4xxClientError() implementation if you need anything extra

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