Docksal File Proxy for Drupal

docksal-local.env

# Should be placed in .docksal/docksal-local.env
# Change URL to location of files
APACHE_FILE_PROXY="http://www.example.com"

docksal-local.yml

# Should be placed in .docksal/dockal-local.yml
version: "2.1"

services:
  web:
    environment:
      - APACHE_FILE_PROXY

httpd-vhost-overrides.conf

# Should be placed in .docksal/etc/apache/httpd-vhost-overrides.conf
<IfModule mod_rewrite.c>
  RewriteEngine on
  # Force image styles that have local files that exist to be generated.
  RewriteCond %{REQUEST_URI} ^/sites/([^\/]*)/files/styles/[^\/]*/public/((.*))$
  RewriteCond %{DOCUMENT_ROOT}/sites/%1/files/%2 -f
  RewriteRule ^(.*)$ $1 [QSA,L]
  # Otherwise, send anything else that's in the files directory to the
  # production server.
  RewriteCond %{ENV:APACHE_FILE_PROXY} !^$
  RewriteCond %{REQUEST_URI} ^/sites/[^\/]*/files/.*$
  RewriteCond %{REQUEST_URI} !^/sites/[^\/]*/files/css/.*$
  RewriteCond %{REQUEST_URI} !^/sites/[^\/]*/files/js/.*$
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule ^(.*)$ %{ENV:APACHE_FILE_PROXY}/$1 [P,L]
</IfModule>