fix: use github.com/vearutop/statigz to embed webUI srcs and improve Accept-Encoding handling

Author: garethgeorge

go.mod

@@ -71,6 +71,7 @@ require (
 	github.com/prometheus/procfs v0.16.1 // indirect
 	github.com/randall77/makefat v0.0.0-20210315173500-7ddd0e42c844 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/vearutop/statigz v1.5.0 // indirect
 	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
 	go.opentelemetry.io/otel v1.35.0 // indirect
 	go.opentelemetry.io/otel/metric v1.35.0 // indirect

go.sum

@@ -164,6 +164,8 @@ github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/vearutop/statigz v1.5.0 h1:FuWwZiT82yBw4xbWdWIawiP2XFTyEPhIo8upRxiKLqk=
+github.com/vearutop/statigz v1.5.0/go.mod h1:oHmjFf3izfCO804Di1ZjB666P3fAlVzJEx2k6jNt/Gk=
 github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 go.etcd.io/bbolt v1.3.11 h1:yGEzV1wPz2yVCLsD8ZAiGHhHVlczyC9d1rP43/VCRJ0=
 go.etcd.io/bbolt v1.3.11/go.mod h1:dksAq7YMXoljX0xu6VF5DMZGbhYYoLUalEiSySYAS4I=

webui/webui.go

@@ -2,8 +2,10 @@ package webui
 
 import (
 	"net/http"
+
+	"github.com/vearutop/statigz"
 )
 
 func Handler() http.Handler {
-
+	return statigz.FileServer(content, statigz.FSPrefix(contentPrefix))
 }

webui/webui_test.go

@@ -38,9 +38,9 @@ func TestServeIndexNoGzip(t *testing.T) {
 
 	// Windows doesn't have the gzip binary, so we skip compression during the
 	// go:generate step on Windows
-	if runtime.GOOS != "windows" && rr.Header().Get("Content-Encoding") != "gzip" {
+	if runtime.GOOS != "windows" && rr.Header().Get("Content-Encoding") != "" {
 		t.Errorf("handler returned wrong content encoding: got %v want %v",
-			rr.Header().Get("Content-Encoding"), "gzip")
+			rr.Header().Get("Content-Encoding"), "")
 	}
 }