Improve vfsgen to not unzip bindata files but send to browser directly (#7109)

* Don't unzip files from bindata but send to browser directly

* remove dependent for httpgzip

* Add tests for parseAcceptEncoding

* Update docs for ENABLE_GZIP

* Fix bug

* Fix bug

Co-authored-by: zeripath <art27@cantab.net>

modules/public/public_test.go

@@ -0,0 +1,40 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package public
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestParseAcceptEncoding(t *testing.T) {
+	var kases = []struct {
+		Header   string
+		Expected map[string]bool
+	}{
+		{
+			Header: "deflate, gzip;q=1.0, *;q=0.5",
+			Expected: map[string]bool{
+				"deflate": true,
+				"gzip":    true,
+			},
+		},
+		{
+			Header: " gzip, deflate, br",
+			Expected: map[string]bool{
+				"deflate": true,
+				"gzip":    true,
+				"br":      true,
+			},
+		},
+	}
+
+	for _, kase := range kases {
+		t.Run(kase.Header, func(t *testing.T) {
+			assert.EqualValues(t, kase.Expected, parseAcceptEncoding(kase.Header))
+		})
+	}
+}