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我无法让我的 RestTemplate GET-Call 自动遵循 308 PERMANENT_REDIRECT 响应。

我有一个以前可以通过 URL https://subdomain1.domain.com/x/y/z访问的 REST 服务（只是一个示例）。它现在移动到https://subdomain2.domain.com/a/y/z（更改子域名和路径的第一部分）。请求旧 URL 时，服务器会以以下响应进行响应：

Status code  : 308 PERMANENT_REDIRECT
Status text  : Permanent Redirect
Headers      : {Server=[openresty/1.15.8.1], Date=[Wed, 18 Sep 2019 18:22:08 GMT], Content-Type=[text/html], Content-Length=[177], Connection=[keep-alive], Location=[https://subdomain2.domain.com/a/y/z], Access-Control-Allow-Headers=[Accept, Accept-Encoding, Authorization, Content-Length, Content-Type, Host, Origin, X-Requested-With, User-Agent, No-Auth-Challenge], Access-Control-Expose-Headers=[Location, ETag, Auth-Token, Auth-Token-Valid-Until, Auth-Token-Location, X-Powered-By], Access-Control-Allow-Origin=[*], Access-Control-Allow-Credentials=[true], Access-Control-Allow-Methods=[GET, OPTIONS, PUT, PATCH, POST, DELETE]}
Response body: <html>
<head><title>308 Permanent Redirect</title></head>
<body>
<center><h1>308 Permanent Redirect</h1></center>
<hr><center>openresty/1.15.8.1</center>
</body>
</html>

我尝试了以下代码行：

RestTemplate restTemplate = new RestTemplate(new SimpleClientHttpRequestFactory());

ResponseEntity<String> response = restTemplate.exchange("https://subdomain1.domain.com/x/y/z", HttpMethod.GET, null, String.class);

System.out.println("Response code: " + response.getStatusCode());
System.out.println(response.getBody());

输出是：

Response code: 308 PERMANENT_REDIRECT
<html>
<head><title>308 Permanent Redirect</title></head>
<body>
<center><h1>308 Permanent Redirect</h1></center>
<hr><center>openresty/1.15.8.1</center>
</body>
</html>

所以重定向没有被遵循。

我还尝试了以下（不同的请求工厂）：

RestTemplate restTemplate = new RestTemplate(new HttpComponentsClientHttpRequestFactory());

ResponseEntity<String> response = restTemplate.exchange("https://subdomain1.domain.com/x/y/z", HttpMethod.GET, null, String.class);

System.out.println("Response code: " + response.getStatusCode());
System.out.println(response.getBody());

还有（来自另一个stackoverflow线程）：

HttpComponentsClientHttpRequestFactory clientHttpRequestFactory = new HttpComponentsClientHttpRequestFactory();
clientHttpRequestFactory.setHttpClient(HttpClientBuilder.create().setRedirectStrategy(new LaxRedirectStrategy()).build());
RestTemplate restTemplate = new RestTemplate(clientHttpRequestFactory);

ResponseEntity<String> response = restTemplate.exchange("https://subdomain1.domain.com/x/y/z", HttpMethod.GET, null, String.class);

System.out.println("Response code: " + response.getStatusCode());
System.out.println(response.getBody());

但结果总是一样的。

关于如何获得遵循 308 永久重定向的请求的任何想法？

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