[PATCH] When cache file is expired, nginx can make a lot of upstream requests.

[Sangdeuk Kwon]

Thank you for your explanation

I have a question.
Are there any directives for preventing multiple upstream and serving new
content?

expect case:
1st request: get new content from origin and serve new content.
2nd request: serve new content.
3rd request: serve new content.

"proxy_cache_use stale updating" and "proxy_cache_background_update off"
case:
1st request: get new content from origin and serve new content.
2nd request: serve stale content.
finish 1st request's upstream.
3rd request: serve new content.

"proxy_cache_use stale updating" and "proxy_cache_background_update on"
case:
1st request: serve stale content and make subrequest for getting new
content.
2nd request: serve stale content.
finish 1st request's subrequest.
3rd request: serve new content.
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