server-configs-nginx/h5bp/web_performance/cache-control.conf

# ----------------------------------------------------------------------
# | Cache Control                                                      |
# ----------------------------------------------------------------------

# TBD
#
# (1) TBD
#
# (2) TBD
#
# (3) TBD
#
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control

map $sent_http_content_type $cache_control {
  # (1)
  default           "private, must-revalidate";

  # (2)
  ~*text/html       "public, immutable";
  ~*text/css        "public, immutable";
  ~*text/javascript "public, immutable";
  ~*xml             "public, immutable";
  ~*application/pdf "public, immutable";

  # (3)
  ~*audio/          "public, immutable";
  ~*image/          "public, immutable";
  ~*font/           "public, immutable";
  ~*video/          "public, immutable";
}

add_header Cache-Control $cache_control;