Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Fastify version

4.28.1

Plugin version

7.0.4

Node.js version

22.8.0

Operating system

Windows

Operating system version (i.e. 20.04, 11.3, 10)

10

Description

Files:

dir/index.html
dir/index.html.br
main.js

main.js:

import fastifyStatic from "@fastify/static";
import Fastify from "fastify";

const fastify = Fastify({logger: true});
fastify.register(fastifyStatic, {
    root: process.cwd(),
    preCompressed: true,
    redirect: true,
});
fastify.listen({port: 80});

When I navigate to http://localhost/dir, I don't get redirected to http://localhost/dir/ as expected.

The redirection only fails if either dir/index.html or dir/index.html.br exists. If dir is empty, the redirection succeeds and I get a 301 followed by a 404.

Link to code that reproduces the bug

No response

Expected Behavior

The redirection works fine if I comment out the line preCompressed: true.