I make a request to the https URL with the postman, I get 400 response and data without any certification config. While I make the same request with restTemplate I get 404 not found with the same url. postman body :

{
  "Request": {
    "usernamenull": "",
    "passwordnull": ""
  },
  "username": "iceicebaby",
  "password": "12345"
}

and Java code:

HttpHeaders headers= new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);
        headers.add("Authorization","Basic ***");
        headers.add("Accept", "*/*");
        RequestBodyModel request = new RequestBodyModel();
        request.setRequest(new UserRequest("",""));
        request.setUsername(userName);
        request.setPassword(password);
        HttpEntity<RequestBodyModel> requestEntity = new HttpEntity<>(request,headers);
        String response = restTemplate.postForObject(url,requestEntity,String.class);

any help appreciated, thanks.

EDIT: I changed my code to :

ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.POST,requestEntity,String.class);

and I get 302 redirect error(Location: same url, server: 'ACB') while postman works perfectly.

The difference between postman and restTemplate is because of their ways to handle redirect.

Postman

Postman automatically redirect your request. As you can see in this screenshot, I think you're postman's automatic redirect option will be turned on too.

restTemplate

But, restTemplate doesn't automatically redirect your requests.

Solution

1. Configure restTemplate to follow redirect

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
</dependency>

.

CloseableHttpClient httpClient = HttpClientBuilder.create()
        .setRedirectStrategy(new LaxRedirectStrategy()) // Enables automatic redirect handling for all HTTP methods
        .build();

HttpComponentsClientHttpRequestFactory requestFactory = 
        new HttpComponentsClientHttpRequestFactory(httpClient);

RestTemplate restTemplate = new RestTemplate(requestFactory);

2. manually handle redirect

ResponseEntity<String> responseEntity = restTemplate.exchange(url, HttpMethod.POST, requestEntity, String.class);
if (responseEntity.getStatusCode() == HttpStatus.FOUND) { // 302 redirect
    String redirectUrl = responseEntity.getHeaders().getLocation().toString();
    // get the redirect Url from header
    ResponseEntity<String> redirectedResponse = restTemplate.exchange(redirectUrl, HttpMethod.GET, new HttpEntity<>(headers), String.class);
}