//headers
HttpHeaders requestHeaders = new HttpHeaders();
requestHeaders.add("api-version", "1.0");
//body
MultiValueMap<String, String> requestBody = new LinkedMultiValueMap<>();
requestBody.add("roundid", "1");
//HttpEntity
HttpEntity<MultiValueMap> requestEntity = new HttpEntity<MultiValueMap>(requestBody, requestHeaders);
RestTemplate restTemplate = new RestTemplate();
//post
ResponseEntity<String> responseEntity = restTemplate.postForEntity("http://xxx", requestEntity, String.class);
System.out.println(responseEntity.getBody());
RestTemplate 添加請求頭headers和請求體body
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