Proxy images from production with Apache

I’m trying to proxy missing images from my Local site from production. Both are installed in a /blog/ subdirectory and both run Apache.

So I added the following .htaccess rule:
<IfModule mod_rewrite.c> RewriteEngine On RewriteBase /blog/ #Redirect WordPress uploads RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-f RewriteRule wp-content/uploads/(.*)$$1 [R=302,L,NC] </IfModule>

But I’m getting errors in the apache log
[proxy:warn] [pid 317:tid 140026654447360] [client] AH01144: No protocol handler was valid for the URL /blog/wp-content/uploads/2018/07/kitten.jpg. If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule., referer: http://example.local/blog/

I tried copying some mods from /conf/apache/mods-available to mods-enabled but that just broke the whole thing.

How do I properly get this configured?