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        HttpHeaders headers = new HttpHeaders();
        headers.set("Host", "");

        RestTemplate restTemplate = new RestTemplate();

        ResponseEntity<String> responseEntity =
                "", HttpMethod.GET,
                new HttpEntity<String>(null, headers), String.class);

原因 に書いてあるが、RestTemplateの基底実装がHttpUrlConnectionの場合はこの挙動になる。詳しい事はリンク先に書いてあるが、セキュリティ上の理由というかRFC準拠でこうなっている(らしい)


System.setProperty("", "true")


もしくは基底実装にApache HttpComponentsを使用する。

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