code: @Override
  	public HttpResponse head() {
  		BasicHttpResponse response = new BasicHttpResponse(this.response.getStatusLine());
  		Header[] allHeaders = this.response.getAllHeaders();
  		for (Header allHeader : allHeaders)
  			response.addHeader(allHeader);
  		response.setEntity(new ByteArrayEntity(new byte[]{}));
  		return response;
  	}
docs: /* (non-Javadoc)
  @see com.gistlabs.mechanize.cache.InMemoryCacheEntry#head()