servers.conf.erb

log_format keyvalue
  'method=$request_method'
  ' path="$request_uri"'
  ' host=$host'
  ' request_id=$http_x_request_id'
  ' from="$remote_addr"'
  ' protocol=$scheme'
  ' status=$status'
  ' duration=${request_time}s'
  ' bytes=$bytes_sent'
  ' referer="$http_referer"'
  ' user_agent="$http_user_agent"';

# In order to avoid logging access twice per request
# it is necessary to turn off the top-level (e.g. http) buildpack default access_log
# as we are about to override it in the server directive here below
access_log off;

port_in_redirect off;

server {
  listen <%= ENV['PORT'] %>;

  charset utf-8;

  # Disable compression that is performed by the Scalingo router anyway
  gzip off;

  root /app/storybook-static/;
}