proxy_buffers 16 16k; proxy_buffer_size 16k;

curl --compressed -so /dev/null https://example.com/ -w '%{size_download}'

curl -so /dev/null https://example.com/ -w '%{size_download}'

proxy_buffer_size 12k; 

curl -s -w \%{size_header} -o /dev/null http://localhost -H "Host: example.com"

curl -s -w \%{size_header} -o /dev/null https://example.com