optimize "Network request failed" retry case #147

Author: adrai

CHANGELOG.md

@@ -1,3 +1,7 @@
+### 2.6.1
+
+- optimize "Failed to fetch" retry case [147](https://github.com/i18next/i18next-http-backend/issues/147)
+
 ### 2.6.0
 
 - fix "Failed to fetch" retry case [147](https://github.com/i18next/i18next-http-backend/issues/147)

i18nextHttpBackend.js

@@ -131,7 +131,7 @@ var Backend = function () {
       this.options.request(this.options, url, payload, function (err, res) {
         if (res && (res.status >= 500 && res.status < 600 || !res.status)) return callback('failed loading ' + url + '; status code: ' + res.status, true);
         if (res && res.status >= 400 && res.status < 500) return callback('failed loading ' + url + '; status code: ' + res.status, false);
-        if (!res && err && err.message && (err.message.indexOf('Failed to fetch') > -1 || err.message.indexOf('failed') > -1 && err.message.indexOf('fetch') > -1)) return callback('failed loading ' + url + ': ' + err.message, true);
+        if (!res && err && err.message && err.message.toLowerCase().indexOf('failed') > -1 && (err.message.indexOf('fetch') > -1 || err.message.toLowerCase().indexOf('network') > -1)) return callback('failed loading ' + url + ': ' + err.message, true);
         if (err) return callback(err, false);
         var ret, parseErr;
         try {