问题
For the 1st request, I get the JSON response. From the next request onwards I start getting this log and HTTP Status Code 204, even though the ServerResource is successfully returning a representation
org.restlet.engine.adapter.ServerAdapter commit
WARNING: A response with an unavailable and potentially non empty entity was returned. Ignoring the entity for resource http://localhost:8888/xyz?abc=def
Application class for wiring routes
@Override
public Restlet createInboundRoot() {
router = new Router(getContext());
CorsService corsService = new CorsService();
corsService.setAllowedOrigins( new HashSet<String>(Arrays.asList("http://example.com")));
corsService.setAllowedCredentials(true);
getServices().add(corsService);
router.attach("/xyz", XYZ.class);
}
Server Resource which handles and returns a JSON Representation
public class XYZ extends ServerResource {
private static final Logger logger = Logger.getLogger("API:XyZ");
@Get(":json")
public Representation handleGetRequest() {
..
return API_RESPONSE_JSON_REPRESENTATION_SUCCESS;
}
}
回答1:
After releasing the response, the representation state available
is set to false. So subsequent calls to the ServerResource
, returns the Representation but in handle()
method it is set to 204 since getResponseEntity().isAvailable()
returns false
.
From ServerResource
:
@Override
public Representation handle() {
...
} finally {
if (Status.CLIENT_ERROR_METHOD_NOT_ALLOWED.equals(getStatus())) {
updateAllowedMethods();
} else if (Status.SUCCESS_OK.equals(getStatus())
&& (getResponseEntity() == null || !getResponseEntity()
.isAvailable())) {
getLogger()
.fine("A response with a 200 (Ok) status should have an entity. "
+ "Changing the status to 204 (No content).");
setStatus(Status.SUCCESS_NO_CONTENT);
}
}
}
return result;
}
SOLUTION
Either return a new representation every time or setAvailable to true before returning the representation
来源:https://stackoverflow.com/questions/37975772/restlet-getting-http-status-code-204-instead-of-200