fastcgi cache bypass empty body

[Anıl Çetin]

Hi All,
currently we are using nginx with fastcgi_cache with php backend. For
some conditions php returns an empty body (that we can not find the
cause) but sends some headers and nginx thinks it is valid. So it stores
the file which results to an empty response for upcoming requests.

Cached response from backend is attached, is there a configuration
option to prevent this?

p.s. I changed the site name to <site> in attachment.
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