This issue has been filed to capture an accepted proposal that arose during JEP review on
http://mail.openjdk.java.net/pipermail/net-dev/2018-April/011314.html

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A carrier type for the initial response information ( to be passed to the BodyHandler API ) is more friendly to future evolution, if more information is required, such as the protocol version.

Something along the lines of:

ResponseInfo {
  int statusCode() {... }
  HttpHeaders responseHeaders { ... }
  HttpClient.Version version() { ... }
}