call to authenticated rest web service fails in case of post method spring boot - rest

Question

I'm trying to consume a rest web service which is authenticated in spring boot application where the Httpmethod is POST,
Below I would like to show how all set up work to consume authenticated web service for HttpMethod.GET and then what changes I try to consume same authenticated web service for HttpMethod.POST and throws 401 Unauthorized ERROR,
RestTemplateFactory to get restTemplte,
public class RestTemplateFactory implements FactoryBean<RestTemplate>, InitializingBean {
#Autowired
private RestTemplate restTemplate;
public RestTemplate getObject() {
return restTemplate;
}
public Class<RestTemplate> getObjectType() {
return RestTemplate.class;
}
public boolean isSingleton() {
return true;
}
public void afterPropertiesSet() {
HttpHost host = new HttpHost("localhost", 9090, "http");
restTemplate = new RestTemplate(
new HttpComponentsClientHttpRequestFactoryBasicAuth(host));
}
}
For basic authentication,
public class HttpComponentsClientHttpRequestFactoryBasicAuth extends HttpComponentsClientHttpRequestFactory {
HttpHost host;
public HttpComponentsClientHttpRequestFactoryBasicAuth(HttpHost host) {
super();
this.host = host;
}
protected HttpContext createHttpContext(HttpMethod httpMethod, URI uri) {
return createHttpContext();
}
private HttpContext createHttpContext() {
AuthCache authCache = new BasicAuthCache();
BasicScheme basicAuth = new BasicScheme();
authCache.put(host, basicAuth);
BasicHttpContext localcontext = new BasicHttpContext();
localcontext.setAttribute(HttpClientContext.AUTH_CACHE, authCache);
return localcontext;
}
}
Calling a authenticated web service for HttpMethod.Get method,
public ResponseEntity<SomeResponse> consumeRestApi(SomeRequest request) throws InvalidDataException {
ResponseEntity<SomeResponse> responseEntity = null;
try {
RestTemplate restTemplate = restTemplateFactory.getRestTemplate();
restTemplate
.getInterceptors()
.add(new BasicAuthorizationInterceptor(username, pwd));
responseEntity = restTemplate.exchange("http://localhost:9090/sendMail?phone=60598745&email=abc#gmail.com", HttpMethod.GET, null, SomeResponse.class);
} catch (Exception e) {
// Exception handing...
}
return responseEntity;
}
And I do have dummy server running at localhost, with HttpMethod.Get and this is the authenticated service I'm trying to consume in above set up,
#RequestMapping(value = "/sendMail", method = RequestMethod.GET)
public ResponseEntity<SomeResponse> sendmail(#RequestParam String phone, #RequestParam String email){
SomeResponse response = SomeResponse.builder()
.id("101")
.type("formdata")
.fieldValues(getFieldValues(phone,email))
.build();
return new ResponseEntity<>(response,HttpStatus.CREATED);
}
When its a HttpMethod.GET method it works perfectly fine with all the set up mentioned above,
Now, I want to change the same web service to be consumed, to accept a HttpMethod.POST
So below are the changes I tried out but it throw back an error of 401 i.e. Unauthorized error
The changes I try for post method,
By keeping the RestTemplateFactory and HttpComponentsClientHttpRequestFactoryBasicAuth same
I first change, the rest api on dummy server to accept request with POST so,
#RequestMapping(value = "/sendMail", method = RequestMethod.POST)
public ResponseEntity<SomeResponse> sendmail(#RequestParam String phone, #RequestParam String email){
// Same as above
}
Next change is calling method with method post,
public ResponseEntity<SomeResponse> consumeRestApi(SomeRequest request) throws InvalidDataException {
ResponseEntity<SomeResponse> responseEntity = null;
try {
RestTemplate restTemplate = restTemplateFactory.getRestTemplate();
restTemplate
.getInterceptors()
.add(new BasicAuthorizationInterceptor(username, pwd));
SomeResponse response = restTemplate.postForObject("http://localhost:9090/sendMail?phone=60598745&email=abc#gmail.com",request, SomeResponse.class);
} catch (Exception e) {
// Exception handling....
}
}
return new ResponseEntity<SomeResponse>(HttpStatus.CREATED);
}
Does anyone has any suggestion where I'm going wrong with this,
Thanks in advance.

Answer 1

I guess the issue lies in your way of creating and configuring the RestTemplate. Spring Boot provides the RestTemplateBuilder to construct a RestTemplate and it has builder methods to do additional configuration.
In addition the RestTemplate is thread safe so instead of re-recreating it to use it you can reuse the created instance. That being said your calling class can be refactored to something like this
public class EndpointTester {
private final RestTemplate rest;
public EndpointTester(RestTemplateBuilder rtb, String username, String pwd) {
this.rest = rtb.basicAuthorization(username, pwd).build();
}
public ResponseEntity<SomeResponse> consumeRestApi(SomeRequest request) throws InvalidDataException {
ResponseEntity<SomeResponse> responseEntity = null;
try {
responseEntity = rest.postForEntity("http://localhost:9090/sendMail?phone=60598745&email=abc#gmail.com", null, SomeResponse.class);
} catch (Exception e) {
// Exception handing...
}
return responseEntity;
}
}
This way you don't need your RestTemplateFactory and HttpComponentsClientHttpRequestFactoryBasicAuth which simplifies your configuration and code.