In a Nginx working as a proxy, I need to set the "Cache-Control" header on a response based on the size defined on their "content-length".
For example, if the response have "150" or less, "Cache-Control" must be "max-age=60", if not, "max-age=3600"
# curl -I 127.0.0.1/test_small.png
HTTP/1.1 200
content-type: image/png
cache-control: max-age=60
content-length: 106
# curl -I 127.0.0.1/test_big.png
HTTP/1.1 200
content-type: image/png
cache-control: max-age=3600
content-length: 250
Maybe it can be done easily if the content-lenght is a fixed value?
