pool.request is undefined

[luiijs]

Prerequisites

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

Fastify version

5.6.0

Plugin version

11.3.0

Node.js version

22.17.0

Operating system

Windows

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

11

Description

{"level":50,"time":1758442323337,"pid":14084,"hostname":"user","reqId":"req-1","req":{"method":"GET","url":"/name","host":"localhost:4000","remoteAddress":"127.0.0.1","remotePort":54726},"res":{"statusCode":500},"err":{"type":"TypeError","message":"pool.request is not a function. (In 'pool.request(req, function(err, res) {\n if (err) {\n done(err);\n return;\n }\n delete res.headers["transfer-encoding"];\n done(null, { statusCode: res.statusCode, headers: res.headers, stream: res.body });\n })', 'pool.request' is undefined)","stack":"TypeError: pool.request is not a function. (In 'pool.request(req, function(err, res) {\n if (err) {\n done(err);\n return;\n }\n delete res.headers["transfer-encoding"];\n done(null, { statusCode: res.statusCode, headers: res.headers, stream: res.body });\n })', 'pool.request' is undefined)\n at handleUndici (C:\Users\user\OneDrive\Masaüstü\Works\Systems\api.workolla.com-micro\auth\node_modules\@fastify\reply-from\lib\request.js:178:10)\n at run (C:\Users\user\OneDrive\Masaüstü\Works\Systems\api.workolla.com-micro\auth\node_modules\@fastify\reply-from\index.js:296:7)\n at requestRetry (C:\Users\user\OneDrive\Masaüstü\Works\Systems\api.workolla.com-micro\auth\node_modules\@fastify\reply-from\index.js:310:5)\n at (C:\Users\user\OneDrive\Masaüstü\Works\Systems\api.workolla.com-micro\auth\node_modules\@fastify\reply-from\index.js:178:5)\n at handler (C:\Users\user\OneDrive\Masaüstü\Works\Systems\api.workolla.com-micro\auth\node_modules\@fastify\http-proxy\index.js:630:11)\n at preHandlerCallbackInner (C:\Users\user\OneDrive\Masaüstü\Works\Systems\api.workolla.com-micro\auth\node_modules\fastify\lib\handleRequest.js:157:24)\n at preHandlerCallback (C:\Users\user\OneDrive\Masaüstü\Works\Systems\api.workolla.com-micro\auth\node_modules\fastify\lib\handleRequest.js:125:5)\n at validationCompleted (C:\Users\user\OneDrive\Masaüstü\Works\Systems\api.workolla.com-micro\auth\node_modules\fastify\lib\handleRequest.js:115:5)\n at preValidationCallback (C:\Users\user\OneDrive\Masaüstü\Works\Systems\api.workolla.com-micro\auth\node_modules\fastify\lib\handleRequest.js:92:5)\n at handler (C:\Users\user\OneDrive\Masaüstü\Works\Systems\api.workolla.com-micro\auth\node_modules\fastify\lib\handleRequest.js:69:7)"},"msg":"pool.request is not a function. (In 'pool.request(req, function(err, res) {\n if (err) {\n done(err);\n return;\n }\n delete res.headers["transfer-encoding"];\n done(null, { statusCode: res.statusCode, headers: res.headers, stream: res.body });\n })', 'pool.request' is undefined)"}
{"level":30,"time":1758442323340,"pid":14084,"hostname":"user","reqId":"req-1","res":{"statusCode":500},"responseTime":5.0395000000003165,"msg":"request completed"}

Example Code:
import fastify from "fastify";
import fastifyHttpProxy from "@fastify/http-proxy";

const Fastify = fastify({
logger: true
})

await Fastify.register(fastifyHttpProxy, {
upstream: "https://google.com",
prefix: "/name"
})

Fastify.listen({ port: 4000, host: '0.0.0.0' })

I am using the latest version of Bun and was able to run it once, but afterwards it started giving me these errors. What should I do?

Link to code that reproduces the bug

https://github.com/luiijs/basic-http-proxy

Expected Behavior

No response