Headers timeout on POST requests

[artur-ma]

Bug Description

POST requests that are done via undici throws "headers timeout error", when requesting simple golang server built on top of fasthttp lib (https://github.com/valyala/fasthttp), it does work with Postman and got client

Reproducible By

Go Server

package main

import (
	"fmt"
	"github.com/fasthttp/router"
	"github.com/valyala/fasthttp"
)

func route(h *handler) *router.Router {
	router := router.New()
	router.POST("/testPost", h.testHandler)
	return router
}

func (h *handler) testHandler(ctx *fasthttp.RequestCtx) {
	defer fmt.Println(`response`)
	
	ctx.SetContentType(`application/json`)
	ctx.SetStatusCode(200)
	ctx.SetBody([]byte(`{}`))
	
	return
}

type handler struct {
}

func newHandler() *handler {
	return &handler{}
}


func main() {
	h := newHandler()
	r := route(h)
	fasthttp.ListenAndServe(`:8989`, r.Handler)
}

undici request

request('http://localhost:8989/testPost', { method: 'POST', body: '{}' }).then(r => console.log('done').catch(e => console.error(e)))

will fail with

HeadersTimeoutError: Headers Timeout Error
    at Timeout.onParserTimeout [as _onTimeout] (<>/node_modules/undici/lib/client.js:955:28)
    at listOnTimeout (internal/timers.js:556:17)
    at processTimers (internal/timers.js:497:7) {
  code: 'UND_ERR_HEADERS_TIMEOUT'
}

Expected Behavior

Resolve and get the response as other clients

Environment

Node v14.16.1
OS 20.4.0 Darwin Kernel Version 20.4.0: Thu Apr 22 21:46:47 PDT 2021; root:xnu-7195.101.2~1/RELEASE_X86_64 x86_64
Undici: 4.0.0

Additional context

Get requests work as expected

I do see Post requests arrive to the server, but looks like undici can not get the response

This is not actual timeout issue, Postman and got finishes this request in about ~3ms
undici waits couple of seconds before the error is thrown

[artur-ma]

ok, looks like I was missing SetConnectionClose on the server side