Фрилансер помог мне найти ответ. Хитрость заключалась в том, что я использовал Scheme = "http" в каждом прокси-запросе, даже httputil.ReverseProxy изначально поддерживает websocket.
func newDirector(origin url.URL) func(*http.Request) {
return func(req *http.Request) {
req.Header.Add("X-Forwarded-Host", req.Host)
req.Header.Add("X-Origin-Host", origin.Host)
req.URL.Scheme = "http"
req.URL.Host = origin.Host
}
}
должно быть
func newDirector(origin url.URL) func(*http.Request) {
return func(req *http.Request) {
req.Header.Add("X-Forwarded-Host", req.Host)
req.Header.Add("X-Origin-Host", origin.Host)
req.URL.Scheme = origin.Scheme
req.URL.Host = origin.Host
}
}
Полный код стал
package main
import (
"bytes"
"io/ioutil"
"log"
"net/http"
"net/http/httputil"
"net/url"
"strconv"
)
func newDirector(origin url.URL) func(*http.Request) {
return func(req *http.Request) {
req.Header.Add("X-Forwarded-Host", req.Host)
req.Header.Add("X-Origin-Host", origin.Host)
req.URL.Scheme = origin.Scheme
req.URL.Host = origin.Host
}
}
func newReplacer(orig, replace string) func(resp *http.Response) error {
return func(resp *http.Response) error {
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
err = resp.Body.Close()
if err != nil {
return err
}
b = bytes.Replace(b, []byte(orig), []byte(replace), -1)
body := ioutil.NopCloser(bytes.NewReader(b))
resp.Body = body
resp.ContentLength = int64(len(b))
resp.Header.Set("Content-Length", strconv.Itoa(len(b)))
return nil
}
}
func Frontend(w http.ResponseWriter, r *http.Request) {
origin, _ := url.Parse("http://localhost:5000/")
director := newDirector(*origin)
proxy := &httputil.ReverseProxy{Director: director}
proxy.ServeHTTP(w, r)
}
func liverload_js(w http.ResponseWriter, r *http.Request) {
origin, _ := url.Parse("http://localhost:35729/")
director := newDirector(*origin)
modifier := newReplacer("this.port = 35729;", "this.port = 443;")
proxy := &httputil.ReverseProxy{Director: director, ModifyResponse: modifier}
proxy.ServeHTTP(w, r)
}
func liverload_ws(w http.ResponseWriter, r *http.Request) {
origin, _ := url.Parse("http://localhost:35729/")
director := newDirector(*origin)
proxy := &httputil.ReverseProxy{Director: director}
proxy.ServeHTTP(w, r)
}
func Bundle_js(w http.ResponseWriter, r *http.Request) {
origin, _ := url.Parse("http://localhost:5000/")
director := newDirector(*origin)
modifier := newReplacer(":35729/livereload.js?snipver=1", ":443/livereload.js?snipver=1")
proxy := &httputil.ReverseProxy{Director: director, ModifyResponse: modifier}
proxy.ServeHTTP(w, r)
}
func main() {
http.HandleFunc("/build/bundle.js", Bundle_js)
http.HandleFunc("/livereload.js", liverload_js)
http.HandleFunc("/livereload", liverload_ws)
http.HandleFunc("/", Frontend)
log.Fatal(http.ListenAndServeTLS(":443", "cert.pem", "key.pem", nil))
}