// DiscoveryClient.javaboolean register() throws Throwable {   logger.info(PREFIX + appPathIdentifier + ": registering service...");   EurekaHttpResponse<Void> httpResponse;   try {       httpResponse = eurekaTransport.registrationClient.register(instanceInfo);   } catch (Exception e) {       logger.warn("{} - registration failed {}"
 
, PREFIX + appPathIdentifier, e.getMessage(), e);       throw e;   }   if (logger.isInfoEnabled()) {       logger.info("{} - registration status: {}", PREFIX + appPathIdentifier, httpResponse.getStatusCode());   }   return httpResponse.getStatusCode() == 204;}// AbstractJerseyEurekaHttpClient.java@Override
 
public EurekaHttpResponse<Void> register(InstanceInfo info) {   String urlPath = "apps/" + info.getAppName();   ClientResponse response = null;   try {       Builder resourceBuilder = jerseyClient.resource(serviceUrl).path(urlPath).getRequestBuilder();       addExtraHeaders(resourceBuilder);       response = resourceBuilder               .header("Accept-Encoding"
 
, "gzip")               .type(MediaType.APPLICATION_JSON_TYPE)               .accept(MediaType.APPLICATION_JSON)               .post(ClientResponse.class, info);       return anEurekaHttpResponse(response.getStatus()).headers(headersOf(response)).build();   } finally {       if (logger.isDebugEnabled()) {           logger.debug("Jersey HTTP POST {}/{} with instance {}; statusCode={}", serviceUrl, urlPath, info.getId(),                   response == null ? "N/A" : response.getStatus());       }       if (response != null) {           response.close();       }   }}