CODEWITHSUNDEEP
springspring-bootresttemplate
Parth Manaktala
Parth Manaktala

Reputation: 1168

GET Request Works in Postman but not with RestTemplate - SpringBoot

I have a request that is working fine when I try to send through postman. I was trying to implement the same using code where I faced an error.

The code i am using -

RestTemplate restTemplate = new RestTemplate();    
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);

MultiValueMap<String, String> map= new LinkedMultiValueMap<String, String>();
map.add("client_id", clientid);
map.add("client_secret",clientsecret);

HttpEntity<?> request = new HttpEntity<>(map, headers);
logger.info(request.toString());

UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(access_token_url)
                    .queryParam("grant_type", "client_credentials");

logger.info("URI -" + builder.toUriString());

ResponseEntity<String> response = restTemplate.exchange(builder.build().encode().toUri(), 
   HttpMethod.GET, request, String.class);
logger.info("Response" + response.getBody());

The error I am getting is -

org.springframework.web.client.HttpClientErrorException$Unauthorized: 401 Unauthorized

But the same works in POSTMAN with the same details.

Something I want to specify

My main concern is I have never seen anywhere sending a GET request with method body, but it is working in POSTMAN and if it is working there why not in the code? Where I am going wrong?

EDIT - 1 Was marked duplicate with This but its a different error code overall. The OP got 500 Internal Server Error as he was giving wrong content type.

EDIT - 2 DEBUG Output-

2019-07-31 14:53:05.208 DEBUG 3576 --- [nio-8080-exec-1] o.s.web.client.RestTemplate              : HTTP GET ORIGINAL_URL?grant_type=client_credentials
2019-07-31 14:53:05.215 DEBUG 3576 --- [nio-8080-exec-1] o.s.web.client.RestTemplate              : Accept=[text/plain, application/json, application/*+json, */*]
2019-07-31 14:53:05.218 DEBUG 3576 --- [nio-8080-exec-1] o.s.web.client.RestTemplate              : Writing [{client_id=[CLIENTID], client_secret=[CLIENT_SECRET]}] as "application/x-www-form-urlencoded"
2019-07-31 14:53:06.976 DEBUG 3576 --- [nio-8080-exec-1] o.s.web.client.RestTemplate              : Response 401 UNAUTHORIZED
2019-07-31 14:53:07.034 DEBUG 3576 --- [nio-8080-exec-1] m.m.a.RequestResponseBodyMethodProcessor : Using 'text/html', given [text/html, application/xhtml+xml, image/webp, image/apng, application/signed-exchange;v=b3, application/xml;q=0.9, */*;q=0.8] and supported [text/plain, */*, text/plain, */*, application/json, application/*+json, application/json, application/*+json]
2019-07-31 14:53:07.035 DEBUG 3576 --- [nio-8080-exec-1] m.m.a.RequestResponseBodyMethodProcessor : Nothing to write: null body
2019-07-31 14:53:07.039 DEBUG 3576 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed 200 OK
2019-07-31 14:53:07.108 DEBUG 3576 --- [io-8080-exec-10] o.s.web.servlet.DispatcherServlet        : GET "/favicon.ico", parameters={}
2019-07-31 14:53:07.119 DEBUG 3576 --- [io-8080-exec-10] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped to ResourceHttpRequestHandler [class path resource [META-INF/resources/], class path resource [resources/], class path resource [static/], class path resource [public/], ServletContext resource [/], class path resource []]
2019-07-31 14:53:07.181 DEBUG 3576 --- [io-8080-exec-10] o.s.web.servlet.DispatcherServlet        : Completed 200 OK

Upvotes: 5

Views: 12486

Answers (3)

Joel
Joel

Reputation: 622

I had a very similar issue. The problem turned out to be that there was a proxy required to access a URI outside the company. Postman had been configured to use the proxy.

Here's the code to fix this:

import java.net.InetSocketAddress;
import java.net.Proxy;
import org.springframework.http.client.SimpleClientHttpRequestFactory;

// Initialize the REST Template with a proxy.
private RestTemplate getRestTemplate(){
    if(restTemplate==null) {
        Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort));
        SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
        requestFactory.setProxy(proxy);
        restTemplate = new RestTemplate(requestFactory);
    }
    return restTemplate;
}

See // https://www.baeldung.com/java-resttemplate-proxy

Upvotes: 0

Eeshwar Ankathi
Eeshwar Ankathi

Reputation: 266

for the same use case, we are using the below implementation.

RestTemplate restTemplate = new RestTemplate();
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
headers.set("Accept", MediaType.APPLICATION_JSON_VALUE);
String token = new String(Base64.getEncoder().encode((clientId + ":" + clientSecret).getBytes()));
headers.add("Authorization", "Basic " + token);
HttpEntity<?> request = new HttpEntity<>(headers);
logger.info(request.toString());
UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(access_token_url).queryParam("grant_type", "client_credentials");
logger.info("URI -" + builder.toUriString());
ResponseEntity<String> response = restTemplate.exchange(builder.build().encode().toUri(), HttpMethod.POST,request, String.class);
logger.info("Response" + response.getBody());

this might help you.

Upvotes: 5

Toerktumlare
Toerktumlare

Reputation: 14732

i suspect the following. You are double encoding your url, change:

restTemplate.exchange(builder.build().encode().toUri(), 
    HttpMethod.GET, request, String.class);

to

restTemplate.exchange(builder.build().toUri(), 
    HttpMethod.GET, request, String.class);

You can easy match your requests by enabling debug for spring web.

application.properties

logging.level.org.springframework.web: DEBUG

Upvotes: 0

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