Remove 2xx check in xSendFile

main_test.go

@@ -287,7 +287,7 @@ func TestDeniedXSendfileDownload(t *testing.T) {
 			t.Fatalf(`X-Sendfile-Type want "X-Sendfile" got %q`, xSendfileType)
 		}
 		w.Header().Set("Content-Disposition", fmt.Sprintf(`attachment; filename="%s"`, contentFilename))
-		w.WriteHeader(404)
+		w.WriteHeader(200)
 		fmt.Fprint(w, "Denied")
 	}))
 	defer ts.Close()

xsendfile.go

@@ -38,7 +38,7 @@ func xSendFile(u *upstream, w http.ResponseWriter, r *http.Request, _ func(http.
 	}
 
 	// Use accelerated file serving
-	if sendfile == "" && upResponse.StatusCode/100 != 2 {
+	if sendfile == "" {
 		// Copy request body otherwise
 		w.WriteHeader(upResponse.StatusCode)