use system props when creating the RestTransport

Author: Fernando Marino

src/main/java/io/weaviate/client6/v1/internal/rest/DefaultRestTransport.java

@@ -43,9 +43,9 @@ public DefaultRestTransport(RestTransportOptions transportOptions) {
     this.transportOptions = transportOptions;
 
     // TODO: doesn't make sense to spin up both?
-    var httpClient = HttpClients.custom()
+    var httpClient = HttpClients.custom().useSystemProperties()
         .setDefaultHeaders(transportOptions.headers());
-    var httpClientAsync = HttpAsyncClients.custom()
+    var httpClientAsync = HttpAsyncClients.custom().useSystemProperties()
         .setDefaultHeaders(transportOptions.headers());
 
     // Apply custom SSL context
@@ -111,8 +111,6 @@ private <RequestT, ResponseT> ClassicHttpRequest prepareClassicRequest(RequestT
     if (body != null) {
       req.setEntity(body, ContentType.APPLICATION_JSON);
     }
-    if (true) {
-    }
     return req.build();
   }