Add headers to request wrapped by ClientResource in Restlet

Question

How do I add my own headers to a request wrapped by ClientResource in Restlet? For example, I've read that you can use the following when working directly with Client:

Form headers = (Form) request.getAttributes().get(HeaderConstants.ATTRIBUTE_HEADERS);
if (headers == null) {
 headers = new Form();
 request.getAttributes().put("org.restlet.http.headers", responseHeaders);
}
headers.add("X-Some-Header", "the value");

However, I am basically following the code provided in their tutorial and I do not know which member of ClientResource should be accessed to set headers:

ClientResource clientResource = new ClientResource("http://webserviceurl");

MyClassResource classResource = clientResource.wrap(classResource.class);

MyClass class;

try { class = resource.retrieve(); } catch (Exception e) { System.out.println("fail."); }

What can I do to modify retrieve() to add some headers?

Answer 1

The ClientResource method has a getRequestAttributes method which is a shortcut for: getRequest().getAttributes().

So you can use it in order to specify your custom headers for the request, as described below:

ClientResource cr = new ClientResource("...");
Series<Header> headers = cr.getRequestAttributes().get(
                                 "org.restlet.http.headers");
headers.set("<header-name>", "<header-value>");

Be aware that most of headers are managed by Restlet by default. To see which headers are supported, have a look at the HeaderUtils class: https://github.com/restlet/restlet-framework-java/blob/master/modules/org.restlet/src/org/restlet/engine/header/HeaderUtils.java.

Edited

With latest versions of Restlet (2.3), a method getHeaders was added:

ClientResource cr = new ClientResource("...");
Series<Header> headers = cr.getHeaders();
headers.set("<header-name>", "<header-value>");

This corresponds to custom headers.

Hope it will help you. Thierry

Answer 2

If you're using restlet 2.0.x (the latest stable version), you need to do this:

ClientResource resource = new ClientResource(yourUrl);
Form headers = (Form)resource.getRequestAttributes().get("org.restlet.http.headers");
if (headers == null) {
    headers = new Form();
    resource.getRequestAttributes().put("org.restlet.http.headers", headers);
}
headers.add("yourHeaderName", yourHeaderValue);
resource.get();
Response response = resource.getResponse();
String text = response.getEntity().getText();
String status = response.getStatus().toString();

Answer 3

This worked for me, so I'm sharing this.

        ClientResource client = new ClientResource(uri);

        Series<Header> headerValue = new Series<>(Header.class);
        Request request = client.getRequest();
        headerValue.add("header name", "header value");
        request.getAttributes().put(HeaderConstants.ATTRIBUTE_HEADERS, headerValue);