upstream response is buffered to a temporary file

[Bai Shen]

I installed nginx with the defaults.  I'm using it as a reverse proxy, but
not caching.  However, I keep getting a lot of entries in the log file
saying that an "upstream response is buffered to a temporary file".  Is
there a way to turn this off?  Will nginx clean out the cache, or do I have
to do it manually?

Thanks.
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