Method ServeModule

web/handler.go:391–515

(w http.ResponseWriter, r *http.Request, filename string, query url.Values, preTransformContent []byte)

}

func (s *Handler) ServeModule(w http.ResponseWriter, r *http.Request, filename string, query url.Values, preTransformContent []byte) {
	indexHtmlStat, err := os.Lstat(filepath.Join(s.config.AppDir, "index.html"))
	if err != nil {
		if os.IsNotExist(err) {
			http.Error(w, "Bad Request", 400)
		} else {
			http.Error(w, "Internal Server Error", 500)
		}
		return
	}

	var modTime uint64
	var size int64
	if preTransformContent != nil {
		xx := xxhash.New()
		xx.Write(preTransformContent)
		modTime = xx.Sum64()
		size = int64(len(preTransformContent))
	} else {
		fi, err := os.Lstat(filepath.Join(s.config.AppDir, filename))
		if err != nil {
			if os.IsNotExist(err) {
				http.Error(w, "Not Found", 404)
			} else {
				http.Error(w, "Internal Server Error", 500)
			}
			return
		}
		modTime = uint64(fi.ModTime().UnixMilli())
		size = fi.Size()
	}
	etag := fmt.Sprintf("w/\"%x-%x-%x-%x%s\"", modTime, size, indexHtmlStat.ModTime().UnixMilli(), indexHtmlStat.Size(), s.etagSuffix)
	if r.Header.Get("If-None-Match") == etag && !query.Has("t") {
		w.WriteHeader(http.StatusNotModified)
		return
	}
	cacheKey := "module-" + filename
	etagCacheKey := cacheKey + ".etag"
	if js, ok := s.loaderCache.Load(cacheKey); ok {
		if e, ok := s.loaderCache.Load(etagCacheKey); ok {
			if e.(string) == etag {
				header := w.Header()
				header.Set("Content-Type", "application/javascript; charset=utf-8")
				if !query.Has("t") {
					header.Set("Cache-Control", "public, max-age=0, must-revalidate")
					header.Set("Etag", etag)
				}
				w.Write(js.([]byte))
				return
			}
		}
	}
	if s.loaderWorker == nil {
		http.Error(w, "Loader worker not started", 500)
		return
	}
	_, importMap, err := s.getAppImportMap()
	if err != nil {