Postman https request works but restTemplate doesn't

Question

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.

Answer 1

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);
}