minimal version that doesn't serve http request with `GOOS=wasip1 GOARCH=wasm go run -exec wasirun main.go`

main.go

package main

import (
	"log"
	"net/http"
	"os"
	"os/signal"

	"github.com/stealthrocket/net/wasip1"
)

func main() {
	go func() {
		listener, err := wasip1.Listen("tcp", "127.0.0.1:3000")
		if err != nil {
			panic(err)
		}

		server := &http.Server{
			Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				w.WriteHeader(http.StatusOK)
				w.Write([]byte("Hello, World!"))
			}),
		}
		log.Printf("Serving in goroutine.")
		if err := server.Serve(listener); err != nil {
			panic(err)
		}
	}()
	c := make(chan os.Signal, 1)
	signal.Notify(c, os.Interrupt)
	log.Printf("Waiting in main goroutine.")
	<-c
	log.Printf("Interrupt received.")
}

yet this works

package main

import (
	"log"
	"net/http"

	"github.com/stealthrocket/net/wasip1"
)

func main() {
	c := make(chan struct{}, 1)
	go func() {
		listener, err := wasip1.Listen("tcp", ":3000")
		if err != nil {
			panic(err)
		}

		server := &http.Server{
			Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				w.WriteHeader(http.StatusOK)
				w.Write([]byte("Hello, World!"))
			}),
		}
		log.Printf("Serving in goroutine on :3000")
		if err := server.Serve(listener); err != nil {
			log.Println(err)
		}
		c <- struct{}{}
	}()
	log.Printf("Waiting in main goroutine.")
	<-c
	log.Printf("End received.")
}