@CheckReturnValue
    public HttpResponse getApplication(String appName) {
        return sendGetRequest(APPS + requireNonNull(appName, "appName"));
    }
Retrieves the registry information whose application name is the specified {@code appName}
from the Eureka.
eureka/src/main/java/com/linecorp/armeria/internal/common/eureka/EurekaWebClient.java