Spring中RestTeamplate请求网页重定向请求

// 扩展LaxRedirectStrategy,记录最终访问的Uri与重定向链路
@Slf4j
public class AdvanceLaxRedirectStrategy extends LaxRedirectStrategy {
    @Override
    public boolean isRedirected(HttpRequest request, HttpResponse response, HttpContext context) throws ProtocolException {
        boolean redirected = super.isRedirected(request, response, context);
        Header[] allHeaders = response.getAllHeaders();
        Set<String> uris = new LinkedHashSet<>();
        for (Header header : allHeaders) {
            if (StringUtils.equals(header.getName(), "Location")) {
                context.setAttribute("uri", header.getValue());
            }
        }


        if (context.getAttribute("uris") != null) {
            uris.addAll(Arrays.asList(context.getAttribute("uris").toString().split(";")));
        }
        Object uri = context.getAttribute("uri");
        if (uri != null) {
            response.setHeader("uri", String.valueOf(uri));
            uris.add(String.valueOf(uri));
        }
        if (!uris.isEmpty()) {
            context.setAttribute("uris", String.join(";", uris));
            response.setHeader("uris", String.join(";", uris));
        }
        return redirected;
    }
}

// 使用自定义重定向
    private static final RestTemplate restTemplate = new RestTemplateBuilder()
            .requestFactory(() -> new HttpComponentsClientHttpRequestFactory(
                    HttpClientBuilder.create().useSystemProperties().setRedirectStrategy(new AdvanceLaxRedirectStrategy()).build()))
            .build();
// 获取最终访问的uri
ResponseEntity<String> entity = restTemplate.getForEntity(url, String.class);
String actualUrl = Optional.ofNullable(entity.getHeaders().getFirst("uri")).orElse(url);