RestTemplate Exchange Timeouts but PostMan Works

Question

I try to make a simple GET request with Spring's RestTemplate.

RestTemplate restTemplate = new RestTemplate();
HttpHeaders headers headers = new HttpHeaders() {
            {
                String auth = username + ":" + password;
                byte[] encodedAuth = Base64.getEncoder().encode(auth.getBytes(StandardCharsets.US_ASCII));
                String authHeader = "Basic " + new String(encodedAuth);
                set(HttpHeaders.AUTHORIZATION, authHeader);
                //set(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON.toString());
            }
        };

ResponseEntity<FileTypeList> response = restTemplate.exchange(endpoint + FILES, HttpMethod.GET, new HttpEntity(headers), FileTypeList.class);
return response.getBody() != null ? response.getBody().getFileTypes() : Collections.emptyList();

This call gets a timeout error:

java.net.ConnectException: Connection timed out: connect
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method) ~[na:1.8.0_161]
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85) ~[na:1.8.0_161]
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_161]
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_161]
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_161]
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_161]
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_161]
    at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_161]
    at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:673) ~[na:1.8.0_161]

But when I try same call with Postman, it properly works.

The endpoint is https://verda.borsaistanbul.com/files

How Spring RestTemplate differs from Postman ?

Answer 1

This solution worked for me; I achieved to add proxy to request header:

SimpleClientHttpRequestFactory clientHttpReq = new SimpleClientHttpRequestFactory();
Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(PROXY, 80));
clientHttpReq.setProxy(proxy);