correcting some behaviors for $DOCKER_HOST, now uses container's private IP instead of localhost

internal/api/v1/version.go

@@ -3,9 +3,10 @@ package v1
 import (
 	"net/http"
 
+	. "github.com/yusing/go-proxy/internal/api/v1/utils"
 	"github.com/yusing/go-proxy/pkg"
 )
 
 func GetVersion(w http.ResponseWriter, r *http.Request) {
-	w.Write([]byte(pkg.GetVersion()))
+	WriteBody(w, []byte(pkg.GetVersion()))
 }