Fix bug of serveStatic of deno adapter

[oussamasf]

What version of Hono are you using?

4.6.9

What runtime/platform is your app running on? (with version if possible)

Deno

What steps can reproduce the bug?

const publicFiles = serveStatic({ root: './public/' })
app.use('/.well-known/*', publicFiles)

when ./public/.well-known/ is an empty folder

What is the expected behavior?

404

What do you see instead?

curl: (18) transfer closed with outstanding read data remaining

Additional information

This is a bug fix from issues #3628

Opening an empty directory with Deno.open returns a ReadableStream, which is not valid for directories. This leads to that behavior and lead also to status code 200 although it supposed to be 404.

To prevent this undesired behavior, I have implemented a guard using Deno.stat to check if the path is a file before attempting to open it.

p.s: the guard added is tested and tests are passed
May I have permission to submit a pull request with this fix?

[EdamAme-x]

I think it's good.

[oussamasf]

pr

[yusukebe]

This is fixed by #3639. Thank you!