CustomRequestInterceptor.java

// RestTemplate interceptor    
public class CustomRequestInterceptor implements ClientHttpRequestInterceptor {

        @Override
        public ClientHttpResponse intercept(
            final HttpRequest request,
            final byte[] body,
            final ClientHttpRequestExecution execution
        ) throws IOException {
            log.info("INTERCEPT {} {} {} body {}", request.getMethodValue(), request.getURI(), request.getHeaders(),
                body);
            final ClientHttpResponse response = execution.execute(request, body);
            return response;
        }
    }

// Use:
// restTemplate.getInterceptors().add(new CustomRequestInterceptor());