Im making api call with postman on url:
https://cex.io/api/order_book/BTC/USD
plain GET no headers no params no nothing. But the same with java:
RestTemplate rt = new RestTemplate();
rt.getForObject("https://cex.io/api/order_book/BTC/USD", String.class);
gets me 403. where is the problem?
RestTemplate sets "User-Agent: Java_version" header, and it seems the site you are trying to query denies access with that user-agent.
You can explicitly set a user-agent instead of the default one like:
HttpHeaders headers = new HttpHeaders();
headers.set("User-agent", "SomeUserAgent");
HttpEntity<String> entity = new HttpEntity<String>(headers);
RestTemplate rt = new RestTemplate();
String result = rt.exchange("https://cex.io/api/order_book/BTC/USD", HttpMethod.GET, entity, String.class).getBody();