HEAD requests on feed.xml sends 404 errors

Describe the bug

HEAD requests on feed.xml send 404 errors

Steps to reproduce

1. curl --head https://127.0.0.1:8080/@name/feed.xml

Expected behavior

HTTP/1.1 200 OK
Date: Fri, 13 Nov 2020 08:56:27 GMT
Server: Apache/2.4.29 (Ubuntu)
Last-Modified: Wed, 07 Oct 2020 10:59:19 GMT
ETag: "29210-5b1129b78dc13"
Accept-Ranges: bytes
Content-Length: 168464
Vary: Accept-Encoding
Content-Type: application/xml

Actual behavior

HTTP/2 404 
server: nginx
content-type: text/html; charset=UTF-8
vary: Accept-Encoding
cache-control: no-store, max-age=0, no-cache
date: Fri, 13 Nov 2020 08:54:19 GMT

Relevant logs and/or screenshots

Context

• Castopod: all versions
• OS: all OS
• Browser: all browsers
• Web server: nginx
• Apple index is failing

Possible fixes

in /app/Config/Routes.php line 436 replace

$routes->get('feed.xml', 'Feed/$1', ['as' => 'podcast_feed']);

with

$routes->add('feed.xml', 'Feed/$1', ['as' => 'podcast_feed']);