Proxy Error // Start and Stop Time for Requests

[Ether8]

When I attempt to request the proxy I get a "KeyError: 'proxy'". Previously, I was able to get the IP address prior to using the proxies. Is there anyway to to get the proxy address that is used.

   def parse_item(self, response):
    	item = {}
    	item['url'] = response.url
    	item['download_latency'] = download_latency = response.request.meta['download_latency']
    	**item['proxy'] = response.request.meta['proxy']**

Separate question from the previous, I was wondering if there was any way to get the start and stop time for a request. I'm trying to get a better understanding of concurrent_requests and how best to maximize request / second.