Crawlera middleware order to enable httpcache - scrapy

Question

I want to not use the crawlera proxy service for pages that are already cached using the httpcache middleware (since I have a limit for the number of calls per month).
I'm using the crawlera middleware, and enabling it using:
DOWNLOADER_MIDDLEWARES = {
'scrapy_crawlera.CrawleraMiddleware': 610}
as recommended in the documentation (https://scrapy-crawlera.readthedocs.io/en/latest/).
Though, after a crawl ends, I get:
2017-04-23 00:14:24 [scrapy.statscollectors] INFO: Dumping Scrapy stats:
{'crawlera/request': 11,
'crawlera/request/method/GET': 11,
'crawlera/response': 11,
'crawlera/response/status/200': 10,
'crawlera/response/status/301': 1,
'downloader/request_bytes': 3324,
'downloader/request_count': 11,
'downloader/request_method_count/GET': 11,
'downloader/response_bytes': 1352925,
'downloader/response_count': 11,
'downloader/response_status_count/200': 10,
'downloader/response_status_count/301': 1,
'dupefilter/filtered': 6,
'finish_reason': 'closespider_pagecount',
'finish_time': datetime.datetime(2017, 4, 22, 22, 14, 24, 839013),
'httpcache/hit': 11,
'log_count/DEBUG': 12,
'log_count/INFO': 9,
'request_depth_max': 1,
'response_received_count': 10,
'scheduler/dequeued': 10,
'scheduler/dequeued/memory': 10,
'scheduler/enqueued': 23,
'scheduler/enqueued/memory': 23,
'start_time': datetime.datetime(2017, 4, 22, 22, 14, 24, 317893)}
2017-04-23 00:14:24 [scrapy.core.engine] INFO: Spider closed (closespider_pagecount)
with
downloader/request_count': 11
crawlera/request/method/GET': 11
httpcache/hit': 11
So I'm not sure whether this calls went through the crawlera proxy service or not. I get the same results when I change the crawlera middleware order to be 901, 749, 751.
Does anyone know what's going under the hood? Are the pages returned directly from the http cache without calling the crawlera server or not?
Thanks!

Answer 1

Consider the number as just a reference to other middlewares.
'scrapy.downloadermiddlewares.httpcache.HttpCacheMiddleware': 600,
'rotating_proxies.middlewares.RotatingProxyMiddleware': 610,
'rotating_proxies.middlewares.BanDetectionMiddleware': 620
Just make sure httpcache.HttpCacheMiddleware has lower number than the proxy middlewares.
This works fine for me.