fix forwarding

app/main.go

@@ -5,6 +5,8 @@ import (
 	"log"
 	"net"
 	"net/http"
+	"net/url"
+	"path"
 	"strings"
 
 	"gfx.cafe/open/gun"
@@ -13,6 +15,8 @@ import (
 var Config struct {
 	Port string
 	Root string
+
+	Remote string
 }
 
 func init() {
@@ -21,8 +25,13 @@ func init() {
 		Config.Port = "8080"
 	}
 	if Config.Root == "" {
-		Config.Root = "./dist"
+		Config.Root = "dist"
 	}
+	if Config.Remote == "" {
+		Config.Remote = "https://beta.lifeto.co"
+	}
+
+	Config.Root = path.Clean(Config.Root)
 }
 
 var hopHeaders = []string{
@@ -58,25 +67,34 @@ func delHopHeaders(header http.Header) {
 }
 
 type Handler struct {
-	c http.Client
+	p ProxyHandler
 }
 
 func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	if strings.HasPrefix(strings.TrimPrefix("/", r.URL.Path), "lifeto") {
-		h.handleProxy(w, r)
+	if strings.HasPrefix(r.URL.Path, "/lifeto") {
+		http.StripPrefix("/lifeto", &h.p).ServeHTTP(w, r)
 		return
 	}
-	h.handleProxy(w, r)
+	h.handleSite(w, r)
 }
-func (h *Handler) handleProxy(w http.ResponseWriter, r *http.Request) {
+
+type ProxyHandler struct {
+	c http.Client
+}
+
+func (h *ProxyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	r.RequestURI = ""
 	if clientIP, _, err := net.SplitHostPort(r.RemoteAddr); err == nil {
 		appendHostToXForwardHeader(r.Header, clientIP)
 	}
+	r.URL, _ = url.Parse(Config.Remote + r.URL.Path)
+	r.Host = r.URL.Host
+
 	resp, err := h.c.Do(r)
 	if err != nil {
 		http.Error(w, "Server Error", http.StatusInternalServerError)
 		log.Println("ServeHTTP:", err)
+		return
 	}
 	defer resp.Body.Close()
 	delHopHeaders(resp.Header)
@@ -86,7 +104,7 @@ func (h *Handler) handleProxy(w http.ResponseWriter, r *http.Request) {
 }
 
 func (h *Handler) handleSite(w http.ResponseWriter, r *http.Request) {
-	http.StripPrefix(Config.Root, http.FileServer(http.Dir(Config.Root))).ServeHTTP(w, r)
+	http.FileServer(http.Dir(Config.Root)).ServeHTTP(w, r)
 }
 
 func main() {