Make rest prefix a proteted metho instead of static property.

zanata-rest-client/src/main/java/org/zanata/rest/client/ZanataProxyFactory.java

@@ -34,7 +34,6 @@ public class ZanataProxyFactory implements ITranslationResourcesFactory
 
    private static final Logger log = LoggerFactory.getLogger(ZanataProxyFactory.class);
    private final ClientRequestFactory crf;
-   private static final String RESOURCE_PREFIX = "rest";
 
    public ZanataProxyFactory(String username, String apiKey, VersionInfo clientApiVersion)
    {
@@ -89,18 +88,23 @@ else if (serverVersion.contains(RestConstant.SNAPSHOT_VERSION) && !serverTimesta
    /**
     * Returns the Base url to be used for rest Requests.
     */
-   protected URL getBaseUrl()
+   private URL getBaseUrl()
    {
       try
       {
-         return new URL(fixBase(crf.getBase()).toString() + RESOURCE_PREFIX);
+         return new URL(fixBase(crf.getBase()).toString() + getUrlPrefix());
       }
       catch (MalformedURLException e)
       {
          throw new RuntimeException(e);
       }
    }
 
+   protected String getUrlPrefix()
+   {
+      return "rest";
+   }
+
    public <T> T createProxy(Class<T> clazz, URI baseUri)
    {
       log.debug("{} proxy uri: {}", clazz.getSimpleName(), baseUri);