Port 3030 hardcoded in /graphiql/bundle.js about thunder HOT 4 OPEN

package graphiql

import (
	"bytes"
	"github.com/samsarahq/thunder/graphql/graphiql"
	"net/http"
	"net/http/httptest"
)

func NewHandler(addr string) http.Handler {
	h := http.StripPrefix("/graphiql/", graphiql.Handler())
	rw := httptest.NewRecorder()
	req, err := http.NewRequest(http.MethodGet, "/graphiql/bundle.js", nil)
	if err != nil {
		panic(err)
	}
	h.ServeHTTP(rw, req)
	bundleJS := bytes.Replace(rw.Body.Bytes(), []byte("ws://localhost:3030/graphql"), []byte("ws://"+addr+"/graphql"), 1)
	return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
		if req.URL.Path == "/graphiql/bundle.js" {
			rw.Header().Add("Content-Type", "application/javascript")
			_, err = rw.Write(bundleJS)
			if err != nil {
				http.Error(rw, err.Error(), http.StatusInternalServerError)
			}
			return
		}

		h.ServeHTTP(rw, req)
	})
}