Proxy max file size

Hi Folks,

Im just trying something out with proxy_pass,

I want to create a small cache for proxy_pass so im using

http { proxy_cache_path /var/nginx/cache levels=1:2
keys_zone=my-cache:8m max_size=1300m inactive=20m; proxy_temp_path
/var/nginx/cache/tmp; server { location / { proxy_pass
http://example.net; proxy_cache my-cache; proxy_cache_valid
200 302 30m; proxy_cache_valid 404 5m; } }}However what
I would like to know is if there is a way to limit the size of the file
being cached, for example if you have files ranging from 1-20mb, however
you only want to cache files smaller then 6mb how would you do it?
Kingsley