关于 java:RestController – 将 POST 请求转发到外部 URL

RestController - Forward POST request to external URL

我正在寻找一种方法，如何转发已向 @RestController 类中的端点发出的 POST 请求，并将其转发到外部 URL，而正文和标头未受影响(当然还从该 API 返回响应)，是可以通过使用一些弹簧功能来做到这一点吗？我发现的唯一解决方案是从 @RequestBody 中提取主体，从 HttpServletRequest 中提取标头，然后使用 RestTemplate 来执行请求。有没有更简单的方法？

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@RequestMapping("/**")
public ResponseEntity mirrorRest(@RequestBody(required = false) String body,
HttpMethod method, HttpServletRequest request, HttpServletResponse response)
throws URISyntaxException {
String requestUrl = request.getRequestURI();

URI uri = new URI("http", null, server, port, null, null, null);
uri = UriComponentsBuilder.fromUri(uri)
.path(requestUrl)
.query(request.getQueryString())
.build(true).toUri();

HttpHeaders headers = new HttpHeaders();
Enumeration<String> headerNames = request.getHeaderNames();
while (headerNames.hasMoreElements()) {
String headerName = headerNames.nextElement();
headers.set(headerName, request.getHeader(headerName));
}

HttpEntity<String> httpEntity = new HttpEntity<>(body, headers);
RestTemplate restTemplate = new RestTemplate();
try {
return restTemplate.exchange(uri, method, httpEntity, String.class);
} catch(HttpStatusCodeException e) {
return ResponseEntity.status(e.getRawStatusCode())
.headers(e.getResponseHeaders())
.body(e.getResponseBodyAsString());
}
}

以上代码取自这个答案。