how to automatically retry after 503 Service Unavailable

[Dan Checkoway]

I'm doing this:

httpClient.setHttpRequestRetryHandler(new DefaultHttpRequestRetryHandler(2,
true));
...
return httpClient.execute(new HttpGet(url), jsonResponseHandler, new
BasicHttpContext());

...but when the server returns "503 Service Unavailable" I don't believe the
retry handler is getting invoked.  My response handler looks like:

    private static final class JsonResponseHandler implements
ResponseHandler<Map> {
        public Map handleResponse(HttpResponse httpResponse) throws
java.io.IOException {
            HttpEntity httpEntity = httpResponse.getEntity();
            try {
                StatusLine statusLine = httpResponse.getStatusLine();
                switch (statusLine.getStatusCode()) {
                case 200: // Should be a valid JSON response
                    return (Map)JSONValue.parseWithException(new
InputStreamReader(httpEntity.getContent()));
                case 503:
                default:
                    throw new
HttpResponseException(statusLine.getStatusCode(), statusLine.toString());
                }
                ...

I'm not 100% sure if throwing that HttpResponseException is causing the
retry to get invoked, but I don't think it is.  Is there anything else I
should be doing in that "case 503:" that would induce a retry automatically?

Or do I need to wrap my own retry logic around the httpClient.execute call?
I'm sure I'm missing something simple.

Dan