Add Proxy to restlet ClientRessource - restlet

Question

I am trying to add proxy settings to a Java Swing client app, which connects and gets data over https from an external server. However the ClientResource (restlet:2.4.0) ignores all efforts with parameters and connects directly to the url? If the syntax is correct, what are the correct parameters?
Further, how can I use system proxy settings?
private static ClientResource getClientResource(String url) {
ClientResource clientResource = null;
try {
// test
Client client = new Client(new Context(), Protocol.HTTPS);
client.getContext().getParameters().add("https.proxyHost", "PROXY_IP");
client.getContext().getParameters().add("https.proxyPort", "PROXY_PORT");
clientResource = new ClientResource(url);
// test
clientResource.setNext(client);
} catch (Exception e) {
e.printStackTrace();
}
return clientResource;
}
private static Response sendGetRequest(String url) {
ClientResource resource = getClientResource(BASE_URL + url);
try {
resource.get();
} catch (ResourceException e){
e.printStackStrace();
return null;
}
return getResponse();
}
EDIT added compiles:
compile 'org.restlet.jse:org.restlet:2.3.12'
compile 'org.restlet.jse:org.restlet.ext.jackson:2.3.12'
// switch to Apache Http Client, enable proxy'
compile 'org.restlet.jse:org.restlet.ext.httpclient:2.3.12'
// httpClient for Class Definitions
compile 'org.apache.httpcomponents:httpclient:4.3'
CURRENT EXCEPTION:
Starting the Apache HTTP client
An error occurred during the communication with the remote HTTP server.
org.apache.http.client.ClientProtocolException
at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:867)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:57)
at org.restlet.ext.httpclient.internal.HttpMethodCall.sendRequest(HttpMethodCall.java:339)
at org.restlet.engine.adapter.ClientAdapter.commit(ClientAdapter.java:105)
at org.restlet.engine.adapter.HttpClientHelper.handle(HttpClientHelper.java:119)
at org.restlet.Client.handle(Client.java:153)

Answer 1

I think this is only supported with the httpClient extension, that relies on the Apache HTTP client library (maven artifact id: org.restlet.ext.httpclient).
You can then either use the system environment properties: http.proxyHost and http.proxyPort, or set these parameters on the client instance (as you did, but names are distinct and documented here ).
Client client = new Client(new Context(), Protocol.HTTPS);
client.getContext().getParameters().add("proxyHost", "PROXY_IP");
client.getContext().getParameters().add("proxyPort", "PROXY_PORT");