How to force nginx to return the Vary: Accept-Encoding header if brotli is used as compression?

Question

Nginx

To return statics, I use the ngx_brotli.
all statics before. compressed.
gtmetrix swears that there is no header Vary: Accept-Encoding
how to add it?
apache is not installed.

Answer 1

How to add a title?
https://nginx.org/ru/docs/http/ngx_http_headers_mo...

Answer 2

If brotli_static is set to on , then the module will set gzip_vary to 1 :
https://github.com/google/ngx_brotli/blob/e7b3b3e4...
https://nginx.org/ru/docs/http/ngx_http_gzip_modul...
which will add a header to the response