使用RestTemplate发起POST请求时遭遇401 Unauthorized错误求助

我使用RestTemplate向指定URL发送API请求时遇到401未授权错误。此前通过相同方式从类似地址https://sometesturl.com/v1/gettoken获取Bearer Token时一切正常，但当时是GET请求，本次为POST请求。查阅资料后发现这类问题大多与HttpHeaders中的授权字段有关，因此尝试过添加或移除"Bearer "前缀，但均未解决问题。

报错日志 #

org.springframework.web.client.HttpClientErrorException$Unauthorized: 401 Unauthorized: [no body]
    at org.springframework.web.client.HttpClientErrorException.create(HttpClientErrorException.java:105) ~[spring-web-5.3.4.jar:5.3.4]

已尝试的操作 #

• 进行过调试，但调试工具中未发现异常
• 在Authorization请求头中尝试添加/移除"Bearer "前缀

相关代码片段 #

//Prepare request header
HttpHeaders headers = new HttpHeaders();
headers.add("Authorization", (bearerToken));
//for above, I have also tried headers.add("Authorization", ("Bearer "+bearerToken));

headers.add("accept", "application/json");
headers.add("content-type", "application/json");
MediaType mediaType = MediaType.APPLICATION_JSON;
headers.setContentType(mediaType);

//Prepare request body
HttpEntity<String> entity = new HttpEntity<>("{\"test\":\"test\"}", headers);

//Build API url
String url = "https://sometesturl.com/v1/search";
UriComponentsBuilder uriBuilder = UriComponentsBuilder.fromHttpUrl(url);
Integer timeoutConnectToken = Integer.valueOf("0");

//Send request to essDocs api
RestTemplate restTemplate = getRestTemplate(timeoutConnectToken);
ResponseEntity<String> response = null;
try {
    response = restTemplate.exchange(uriBuilder.build().toUriString(), HttpMethod.POST, entity, String.class);
    logger.info("Received Search API Response : {}", response);
} catch (ResourceAccessException e) {
    logger.error("ResourceAccessException: {}", e.getMessage());
} catch (Exception e) {
    logger.error("Error querying REST API: {}, {}", e.getMessage(), e);
}

内容的提问来源于stack exchange，提问作者Cheryl