web: remove dead code (#47097)

lib/web/cachehandler.go

@@ -20,22 +20,22 @@ package web
 
 import (
 	"net/http"
-	"path/filepath"
+	"path"
 	"slices"
 	"time"
 
 	"github.com/gravitational/teleport/lib/httplib"
 )
 
-// makeCacheHandler adds support for gzip compression for given handler.
+// makeCacheHandler sets cache headers for cacheable file types.
 func makeCacheHandler(handler http.Handler, etag string) http.Handler {
 	cachedFileTypes := []string{".woff", ".woff2", ".ttf"}
 
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		// We can cache fonts "permanently" because we don't expect them to change. The rest of our
 		// assets will have an ETag associated with them (teleport version) that will allow us
 		// to conditionally send the updated assets or a 304 status (Not Modified) response
-		if slices.Contains(cachedFileTypes, filepath.Ext(r.URL.Path)) {
+		if slices.Contains(cachedFileTypes, path.Ext(r.URL.Path)) {
 			httplib.SetCacheHeaders(w.Header(), time.Hour*24*365 /* one year */)
 		} else {
 			httplib.SetEntityTagCacheHeaders(w.Header(), etag)