HEAD request on a static file should return Content-Length

[ihipop]

RFC 9110

Section 9.3.2.

HEAD

The HEAD method is identical to GET except that the server MUST NOT send a message body in the response.

The server SHOULD send the same header fields in response to a HEAD request as it would have sent if the request had been a GET, except that the payload header fields (Section 6.4) MAY be omitted.

This method can be used for obtaining metadata about the selected representation without transferring the representation data.

https://www.rfc-editor.org/rfc/rfc9110#section-9.3.2:~:text=the%20server%20should%20send%20the%20same%20header%20fields%20in%20response%20to%20a%20head%20request%20as%20it%20would%20have%20sent%20if%20the%20request%20method%20had%20been%20get

curl -I 'http://192.168.0.214:9091/original.mkv'
HTTP/1.1 200 OK
Accept-Ranges: bytes
content-type: video/x-matroska
Content-Length: 0
Cache-Control: public, max-age=604800
Last-Modified: Tue, 29 Jul 2025 01:15:23 GMT
ETag: W/"6984d317-688820ab.0"
Date: Wed, 30 Jul 2025 16:26:56 GMT

curl -s -D - -o /dev/null http://192.168.0.214:9091/original.mkv
HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Type: video/x-matroska
Content-Length: 229630
Cache-Control: public, max-age=604800
Last-Modified: Wed, 30 Jul 2025 16:28:04 GMT
ETag: W/"380fe-688a4814.0"
Date: Wed, 30 Jul 2025 16:30:21 GMT

simple-http-server -V    
Simple HTTP(s) Server 0.6.13