defaultRequestConfig never used in InternalHttpClient

after initializing builder en building client, the timeout settings are not used for the request execution. In ClosableHttpClient.doExecute(), an on the fly request config is used.

my code:

builder = HttpClientBuilder.create();
int timeout = 30000;
defaultRequestConfig = RequestConfig.custom()
.setSocketTimeout(timeout)
.setConnectTimeout(timeout)
.build();
builder.setDefaultRequestConfig(defaultRequestConfig);
List<Header> headers = new ArrayList<Header>();
headers.add(new BasicHeader("Accept", "application/json"));
builder.setDefaultHeaders(headers);
builder.useSystemProperties();
client = builder.build();
client.execute(request)

timeout settings are never used!