jersey 1 REST client with proxy

Question

How can I implement a jersey 1 client with a http proxy? I find many information on the net about jersey 2 but no jersey 1. Any idea?

My client is currently created like this:

ClientConfig config = new DefaultClientConfig();
config.getFeatures().put(JSONConfiguration.FEATURE_POJO_MAPPING, Boolean.TRUE);
Client client = Client.create(config);