POST方法应沿着HTTP请求对象发送。并且该请求可以包含HTTP标头或HTTP正文或两者。
因此，让我们创建一个HTTP实体，并在正文中发送标头和参数。
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
MultiValueMap<String, String> map= new LinkedMultiValueMap<String, String>();
map.add("email", "first.last@example.com");
httpentity<MultiValueMap<String, String>> request = new httpentity<MultiValueMap<String, String>>(map, headers);
ResponseEntity<String> response = restTemplate.postForEntity( url, request , String.class );
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