# ----------------------------------------------------------------------
# | Content transformation                                             |
# ----------------------------------------------------------------------

# Prevent intermediate caches or proxies (e.g.: such as the ones
# used by mobile network providers) from modifying the website's
# content.
#
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control
# https://tools.ietf.org/html/rfc2616#section-14.9.5
#
# (!) If you are using `ngx_pagespeed`, please note that setting
# the `Cache-Control: no-transform` response header will prevent
# `PageSpeed` from rewriting `HTML` files, and, if the
# `pagespeed DisableRewriteOnNoTransform off` directive isn't used,
# also from rewriting other resources.
#
# https://developers.google.com/speed/pagespeed/module/configuration#notransform

add_header Cache-Control "no-transform";