Update

vendor/tailscale.com/tsweb/compserve/gzip.go

@@ -0,0 +1,43 @@
+// Copyright (c) Tailscale Inc & contributors
+// SPDX-License-Identifier: BSD-3-Clause
+
+package compserve
+
+import (
+	"compress/gzip"
+	"io"
+	"io/fs"
+)
+
+// Gzip serves gzip-precompressed variants ("*.gz"). It exists for
+// transitional compatibility with file systems built before zstd-only
+// asset generation, such as web-client-prebuilt modules published before
+// cmd/build-webclient stopped writing gzip; file systems built since
+// contain no .gz variants and never select it.
+var Gzip = Encoding{
+	Token:      "gzip",
+	Ext:        ".gz",
+	Decompress: decompressGzip,
+}
+
+// decompressGzip wraps f in a streaming gzip decompressor, taking
+// ownership of f.
+func decompressGzip(f fs.File) (io.ReadCloser, error) {
+	zr, err := gzip.NewReader(f)
+	if err != nil {
+		f.Close()
+		return nil, err
+	}
+	return &gzipFile{f: f, Reader: zr}, nil
+}
+
+// gzipFile is a gzip.Reader reading from f; Close closes both.
+type gzipFile struct {
+	f fs.File
+	*gzip.Reader
+}
+
+func (g *gzipFile) Close() error {
+	g.Reader.Close()
+	return g.f.Close()
+}