/subj

repro

1. curl https://cataas.com/cat > static/meow

2. run:

const app = new Hono()
app.use('/*', serveStatic({
  root: 'static',
  onFound: (path, ctx) => {
    ctx.res.headers.set('Content-Type', 'image/jpeg')
  }
})

serve(app)

3. curl -I localhost:3000/meow

expected

Content-Type header is set to image/jpeg

actual

Content-Type header is set to application/octet-stream because there is no extension

additional context

https://github.com/honojs/node-server/blob/main/src/serve-static.ts#L108-L111 – onFound is called before the mime type is derived from the extension, so simply moving it a few lines down should solve this