Does not support HEAD requests

```
$ curl --head https://frisbii.fly.dev/ipfs/bafkreih25dih6ug3xtj73vswccw423b56ilrwmnos4cbwhrceudopdp5sq
HTTP/2 405
allow: GET
date: Tue, 18 Feb 2025 10:29:25 GMT
content-length: 18
content-type: text/plain; charset=utf-8
server: Fly/eb1a25638 (2025-02-13)
via: 2 fly.io
fly-request-id: 01JMC9NZ60R969853JYHB3EJXG-arn
```

Although ..

> The [Trustless Gateway Spec](https://specs.ipfs.tech/http-gateways/trustless-gateway/#head-ipfs-cid-path-params) requires supporting HEAD requests.

.. as mentioned in https://github.com/CheckerNetwork/spark-checker/issues/104

No source file or test is identified in the issue. Reproduce the request with the provided curl command, then locate the deployed HTTP routing entry point and its tests; done means the CID endpoint accepts HEAD and returns the expected headers instead of HTTP 405.

Written by the indexing model from the issue text.