Caddyfile example 'templates' entry seems to conflict

[fwdIT]

Using latest caddy image and latest 4.* invoiceninja image

When trying to create an invoice on a clean install or trying to open invoice settings, I get this error:

web_1  | {"level":"error","ts":1592149644.1447153,"logger":"http.log.error","msg":"template: index.php:1315: function \"filesize\" not defined","request":{"method":"GET","uri":"/settings/invoice_settings","proto":"HTTP/2.0","remote_addr":"192.168.0.xxx:61945","host":"xxx","headers":{"Upgrade-Insecure-Requests":["1"],"Te":["trailers"],"User-Agent":["Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Firefox/78.0"],"Accept":["text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8"],"Accept-Encoding":["gzip, deflate, br"],"Referer":["https://invoiceninja.vlan.app/settings/system_settings"],"Cookie":["ninja_session=xxx; XSRF-TOKEN=xxx; cookieconsent_status=dismiss"],"Accept-Language":["en-US,en;q=0.5"],"Dnt":["1"]},"tls":{"resumed":true,"version":772,"ciphersuite":4867,"proto":"h2","proto_mutual":true,"server_name":"xxx"}},"duration":0.193751456,"status":500,"err_id":"1hbc5i79t","err_trace":"templates.(*Templates).executeTemplate (templates.go:305)"}

app_1  | 172.28.0.26 -  14/Jun/2020:15:47:23 +0000 "GET index.php" 200

After some testing and in the end just logical thinking based on what I see above, it seemed that the app image (being the php invoiceninja one) gave a nice clean response with http code 200. It was however the caddy web image which started complaining. Took me some time to realise that it probably also wanted to handle the end result as a template for it's own internal templating which seems to fail. I suspect what the php image sends back has some content in tags which caddy wants to interpret.

In general I don't see any reason to have templates in the Caddyfile but I am new to both invoiceninja and caddy. Nevertheless, removing it makes these invoiceninja components work.

This is my working Caddyfile:

{$APP_URL} {
  root * /var/www/app/public
  php_fastcgi app:9000
  encode zstd gzip
  file_server browse
}

[codedge]

@fwdIT I'll have a look into that but what you found out looks very valid. I'l lget back to you soon.