diff --git a/demo/trunk/node_modules/.yarn-integrity b/demo/trunk/node_modules/.yarn-integrity
index 680e8471..b1e63103 100644
--- a/demo/trunk/node_modules/.yarn-integrity
+++ b/demo/trunk/node_modules/.yarn-integrity
@@ -28,25 +28,24 @@
     "@babel/runtime@^7.23.2": "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.23.2.tgz#062b0ac103261d68a966c4c7baf2ae3e62ec3885",
     "@eslint-community/eslint-utils@^4.2.0": "https://registry.yarnpkg.com/@eslint-community/eslint-utils/-/eslint-utils-4.4.0.tgz#a23514e8fb9af1269d5f7788aa556798d61c6b59",
     "@eslint-community/regexpp@^4.11.0": "https://registry.yarnpkg.com/@eslint-community/regexpp/-/regexpp-4.11.0.tgz#b0ffd0312b4a3fd2d6f77237e7248a5ad3a680ae",
-    "@eslint/config-array@^0.17.1": "https://registry.yarnpkg.com/@eslint/config-array/-/config-array-0.17.1.tgz#d9b8b8b6b946f47388f32bedfd3adf29ca8f8910",
+    "@eslint/config-array@^0.18.0": "https://registry.yarnpkg.com/@eslint/config-array/-/config-array-0.18.0.tgz#37d8fe656e0d5e3dbaea7758ea56540867fd074d",
     "@eslint/eslintrc@^3.1.0": "https://registry.yarnpkg.com/@eslint/eslintrc/-/eslintrc-3.1.0.tgz#dbd3482bfd91efa663cbe7aa1f506839868207b6",
-    "@eslint/js@9.9.0": "https://registry.yarnpkg.com/@eslint/js/-/js-9.9.0.tgz#d8437adda50b3ed4401964517b64b4f59b0e2638",
-    "@eslint/js@^9.4.0": "https://registry.yarnpkg.com/@eslint/js/-/js-9.9.0.tgz#d8437adda50b3ed4401964517b64b4f59b0e2638",
+    "@eslint/js@9.9.1": "https://registry.yarnpkg.com/@eslint/js/-/js-9.9.1.tgz#4a97e85e982099d6c7ee8410aacb55adaa576f06",
+    "@eslint/js@^9.4.0": "https://registry.yarnpkg.com/@eslint/js/-/js-9.9.1.tgz#4a97e85e982099d6c7ee8410aacb55adaa576f06",
     "@eslint/object-schema@^2.1.4": "https://registry.yarnpkg.com/@eslint/object-schema/-/object-schema-2.1.4.tgz#9e69f8bb4031e11df79e03db09f9dbbae1740843",
     "@humanwhocodes/module-importer@^1.0.1": "https://registry.yarnpkg.com/@humanwhocodes/module-importer/-/module-importer-1.0.1.tgz#af5b2691a22b44be847b0ca81641c5fb6ad0172c",
     "@humanwhocodes/retry@^0.3.0": "https://registry.yarnpkg.com/@humanwhocodes/retry/-/retry-0.3.0.tgz#6d86b8cb322660f03d3f0aa94b99bdd8e172d570",
     "@nodelib/fs.scandir@2.1.5": "https://registry.yarnpkg.com/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz#7619c2eb21b25483f6d167548b4cfd5a7488c3d5",
     "@nodelib/fs.stat@2.0.5": "https://registry.yarnpkg.com/@nodelib/fs.stat/-/fs.stat-2.0.5.tgz#5bd262af94e9d25bd1e71b05deed44876a222e8b",
     "@nodelib/fs.walk@^1.2.8": "https://registry.yarnpkg.com/@nodelib/fs.walk/-/fs.walk-1.2.8.tgz#e95737e8bb6746ddedf69c556953494f196fe69a",
-    "@stylistic/eslint-plugin-js@^2.1.0": "https://registry.yarnpkg.com/@stylistic/eslint-plugin-js/-/eslint-plugin-js-2.6.4.tgz#52e2b89e1f0878aaeeca3be832287bc060d3a422",
-    "@types/eslint@^9.6.0": "https://registry.yarnpkg.com/@types/eslint/-/eslint-9.6.0.tgz#51d4fe4d0316da9e9f2c80884f2c20ed5fb022ff",
+    "@stylistic/eslint-plugin-js@^2.1.0": "https://registry.yarnpkg.com/@stylistic/eslint-plugin-js/-/eslint-plugin-js-2.7.2.tgz#cf21cc843cd3011e9848072505bf61c491a415e7",
+    "@types/eslint@^9.6.1": "https://registry.yarnpkg.com/@types/eslint/-/eslint-9.6.1.tgz#d5795ad732ce81715f27f75da913004a56751584",
     "@types/estree@*": "https://registry.yarnpkg.com/@types/estree/-/estree-1.0.5.tgz#a6ce3e556e00fd9895dd872dd172ad0d4bd687f4",
     "@types/json-schema@*": "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.15.tgz#596a1747233694d50f6ad8a7869fcb6f56cf5841",
     "abbrev@1": "https://registry.yarnpkg.com/abbrev/-/abbrev-1.1.1.tgz#f8f2c887ad10bf67f634f005b6987fed3179aac8",
     "accepts@~1.3.4": "https://registry.yarnpkg.com/accepts/-/accepts-1.3.7.tgz#531bc726517a3b2b41f850021c6cc15eaab507cd",
     "acorn-jsx@^5.3.2": "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-5.3.2.tgz#7ed5bb55908b3b2f1bc55c6af1653bada7f07937",
     "acorn@^8.12.0": "https://registry.yarnpkg.com/acorn/-/acorn-8.12.1.tgz#71616bdccbe25e27a54439e0046e89ca76df2248",
-    "acorn@^8.12.1": "https://registry.yarnpkg.com/acorn/-/acorn-8.12.1.tgz#71616bdccbe25e27a54439e0046e89ca76df2248",
     "ajv@^6.12.4": "https://registry.yarnpkg.com/ajv/-/ajv-6.12.6.tgz#baf5a62e802b07d977034586f8c3baf5adf26df4",
     "ansi-regex@^2.0.0": "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-2.1.1.tgz#c3b33ab5ee360d86e0e628f0468ae7ef27d654df",
     "ansi-regex@^5.0.1": "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-5.0.1.tgz#082cb2c89c9fe8659a311a53bd6a4dc5301db304",
@@ -64,8 +63,7 @@
     "batch@0.6.1": "https://registry.yarnpkg.com/batch/-/batch-0.6.1.tgz#dc34314f4e679318093fc760272525f94bf25c16",
     "body@^5.1.0": "https://registry.yarnpkg.com/body/-/body-5.1.0.tgz#e4ba0ce410a46936323367609ecb4e6553125069",
     "brace-expansion@^1.1.7": "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd",
-    "braces@^3.0.1": "https://registry.yarnpkg.com/braces/-/braces-3.0.3.tgz#490332f40919452272d55a8480adc0c441358789",
-    "braces@^3.0.2": "https://registry.yarnpkg.com/braces/-/braces-3.0.3.tgz#490332f40919452272d55a8480adc0c441358789",
+    "braces@^3.0.3": "https://registry.yarnpkg.com/braces/-/braces-3.0.3.tgz#490332f40919452272d55a8480adc0c441358789",
     "bytes@1": "https://registry.yarnpkg.com/bytes/-/bytes-1.0.0.tgz#3569ede8ba34315fab99c3e92cb04c7220de1fa8",
     "call-bind@^1.0.0": "https://registry.yarnpkg.com/call-bind/-/call-bind-1.0.2.tgz#b1d4e89e688119c3c9a903ad30abb2f6a919be3c",
     "callsites@^3.0.0": "https://registry.yarnpkg.com/callsites/-/callsites-3.1.0.tgz#b3630abd8943432f54b3f0519238e33cd7df2f73",
@@ -104,7 +102,7 @@
     "eslint-scope@^8.0.2": "https://registry.yarnpkg.com/eslint-scope/-/eslint-scope-8.0.2.tgz#5cbb33d4384c9136083a71190d548158fe128f94",
     "eslint-visitor-keys@^3.3.0": "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-3.4.1.tgz#c22c48f48942d08ca824cc526211ae400478a994",
     "eslint-visitor-keys@^4.0.0": "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-4.0.0.tgz#e3adc021aa038a2a8e0b2f8b0ce8f66b9483b1fb",
-    "eslint@^9.4.0": "https://registry.yarnpkg.com/eslint/-/eslint-9.9.0.tgz#8d214e69ae4debeca7ae97daebbefe462072d975",
+    "eslint@^9.4.0": "https://registry.yarnpkg.com/eslint/-/eslint-9.9.1.tgz#147ac9305d56696fb84cf5bdecafd6517ddc77ec",
     "espree@^10.0.1": "https://registry.yarnpkg.com/espree/-/espree-10.1.0.tgz#8788dae611574c0f070691f522e4116c5a11fc56",
     "espree@^10.1.0": "https://registry.yarnpkg.com/espree/-/espree-10.1.0.tgz#8788dae611574c0f070691f522e4116c5a11fc56",
     "esprima@^4.0.0": "https://registry.yarnpkg.com/esprima/-/esprima-4.0.1.tgz#13b04cdb3e6c5d19df91ab6987a8695619b0aa71",
@@ -173,7 +171,7 @@
     "http-parser-js@>=0.5.1": "https://registry.yarnpkg.com/http-parser-js/-/http-parser-js-0.5.3.tgz#01d2709c79d41698bb01d4decc5e9da4e4a033d9",
     "http2-wrapper@^2.2.1": "https://registry.yarnpkg.com/http2-wrapper/-/http2-wrapper-2.2.1.tgz#310968153dcdedb160d8b72114363ef5fce1f64a",
     "i18next-browser-languagedetector@~8.0.0": "https://registry.yarnpkg.com/i18next-browser-languagedetector/-/i18next-browser-languagedetector-8.0.0.tgz#b6fdd9b43af67c47f2c26c9ba27710a1eaf31e2f",
-    "i18next-http-backend@~2.6.0": "https://registry.yarnpkg.com/i18next-http-backend/-/i18next-http-backend-2.6.0.tgz#e2a2bc391b129c17d4918e9574962df6dc130327",
+    "i18next-http-backend@~2.6.0": "https://registry.yarnpkg.com/i18next-http-backend/-/i18next-http-backend-2.6.1.tgz#186c3a1359e10245c9119a13129f9b5bf328c9a7",
     "i18next@~23.14.0": "https://registry.yarnpkg.com/i18next/-/i18next-23.14.0.tgz#d415a858390cc849f3db0df539cb2bbfe24a3cdb",
     "iconv-lite@~0.6.3": "https://registry.yarnpkg.com/iconv-lite/-/iconv-lite-0.6.3.tgz#a52f80bf38da1952eb5c681790719871a1a72501",
     "ignore@^5.2.0": "https://registry.yarnpkg.com/ignore/-/ignore-5.2.4.tgz#a291c0c6178ff1b960befe47fcdec301674a6324",
@@ -232,8 +230,8 @@
     "magic-wand-tool@~1.1.7": "https://registry.yarnpkg.com/magic-wand-tool/-/magic-wand-tool-1.1.7.tgz#c1d49c5f26307bec06eb8c6ac51e03fff5b9d61b",
     "make-iterator@^1.0.0": "https://registry.yarnpkg.com/make-iterator/-/make-iterator-1.0.1.tgz#29b33f312aa8f547c4a5e490f56afcec99133ad6",
     "map-cache@^0.2.0": "https://registry.yarnpkg.com/map-cache/-/map-cache-0.2.2.tgz#c32abd0bd6525d9b051645bb4f26ac5dc98a0dbf",
-    "micromatch@^4.0.2": "https://registry.yarnpkg.com/micromatch/-/micromatch-4.0.4.tgz#896d519dfe9db25fce94ceb7a500919bf881ebf9",
-    "micromatch@^4.0.4": "https://registry.yarnpkg.com/micromatch/-/micromatch-4.0.5.tgz#bc8999a7cbbf77cdc89f132f6e467051b49090c6",
+    "micromatch@^4.0.2": "https://registry.yarnpkg.com/micromatch/-/micromatch-4.0.8.tgz#d66fa18f3a47076789320b9b1af32bd86d9fa202",
+    "micromatch@^4.0.4": "https://registry.yarnpkg.com/micromatch/-/micromatch-4.0.8.tgz#d66fa18f3a47076789320b9b1af32bd86d9fa202",
     "mime-db@1.47.0": "https://registry.yarnpkg.com/mime-db/-/mime-db-1.47.0.tgz#8cb313e59965d3c05cfbf898915a267af46a335c",
     "mime-types@~2.1.17": "https://registry.yarnpkg.com/mime-types/-/mime-types-2.1.30.tgz#6e7be8b4c479825f85ed6326695db73f9305d62d",
     "mime-types@~2.1.24": "https://registry.yarnpkg.com/mime-types/-/mime-types-2.1.30.tgz#6e7be8b4c479825f85ed6326695db73f9305d62d",
@@ -281,7 +279,6 @@
     "path-parse@^1.0.6": "https://registry.yarnpkg.com/path-parse/-/path-parse-1.0.7.tgz#fbc114b60ca42b30d9daf5858e4bd68bbedb6735",
     "path-root-regex@^0.1.0": "https://registry.yarnpkg.com/path-root-regex/-/path-root-regex-0.1.2.tgz#bfccdc8df5b12dc52c8b43ec38d18d72c04ba96d",
     "path-root@^0.1.1": "https://registry.yarnpkg.com/path-root/-/path-root-0.1.1.tgz#9a4a6814cac1c0cd73360a95f32083c8ea4745b7",
-    "picomatch@^2.2.3": "https://registry.yarnpkg.com/picomatch/-/picomatch-2.2.3.tgz#465547f359ccc206d3c48e46a1bcb89bf7ee619d",
     "picomatch@^2.3.1": "https://registry.yarnpkg.com/picomatch/-/picomatch-2.3.1.tgz#3ba3833733646d9d3e4995946c1365a67fb07a42",
     "portscanner@^2.2.0": "https://registry.yarnpkg.com/portscanner/-/portscanner-2.2.0.tgz#6059189b3efa0965c9d96a56b958eb9508411cf1",
     "prelude-ls@^1.2.1": "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.2.1.tgz#debc6489d7a6e6b0e7611888cec880337d316396",
diff --git a/demo/trunk/node_modules/i18next-http-backend/CHANGELOG.md b/demo/trunk/node_modules/i18next-http-backend/CHANGELOG.md
index 5f4a23f6..fa7e2ab1 100644
--- a/demo/trunk/node_modules/i18next-http-backend/CHANGELOG.md
+++ b/demo/trunk/node_modules/i18next-http-backend/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)
diff --git a/demo/trunk/node_modules/i18next-http-backend/cjs/index.js b/demo/trunk/node_modules/i18next-http-backend/cjs/index.js
index 08410b5a..ee692a6b 100644
--- a/demo/trunk/node_modules/i18next-http-backend/cjs/index.js
+++ b/demo/trunk/node_modules/i18next-http-backend/cjs/index.js
@@ -109,7 +109,7 @@ 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 {
diff --git a/demo/trunk/node_modules/i18next-http-backend/esm/index.js b/demo/trunk/node_modules/i18next-http-backend/esm/index.js
index 0ca669fe..7ef52bf1 100644
--- a/demo/trunk/node_modules/i18next-http-backend/esm/index.js
+++ b/demo/trunk/node_modules/i18next-http-backend/esm/index.js
@@ -102,7 +102,7 @@ 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 {
diff --git a/demo/trunk/node_modules/i18next-http-backend/i18nextHttpBackend.js b/demo/trunk/node_modules/i18next-http-backend/i18nextHttpBackend.js
index 5abdf4ed..d2d55ae8 100644
--- a/demo/trunk/node_modules/i18next-http-backend/i18nextHttpBackend.js
+++ b/demo/trunk/node_modules/i18next-http-backend/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 {
diff --git a/demo/trunk/node_modules/i18next-http-backend/i18nextHttpBackend.min.js b/demo/trunk/node_modules/i18next-http-backend/i18nextHttpBackend.min.js
index 8d0157e3..9166d313 100644
--- a/demo/trunk/node_modules/i18next-http-backend/i18nextHttpBackend.min.js
+++ b/demo/trunk/node_modules/i18next-http-backend/i18nextHttpBackend.min.js
@@ -1 +1 @@
-!function(e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define([],e):("undefined"!=typeof window?window:"undefined"!=typeof global?global:"undefined"!=typeof self?self:this).i18nextHttpBackend=e()}(function(){return function o(r,i,a){function s(t,e){if(!i[t]){if(!r[t]){var n="function"==typeof require&&require;if(!e&&n)return n(t,!0);if(f)return f(t,!0);throw(e=new Error("Cannot find module '"+t+"'")).code="MODULE_NOT_FOUND",e}n=i[t]={exports:{}},r[t][0].call(n.exports,function(e){return s(r[t][1][e]||e)},n,n.exports,o,r,i,a)}return i[t].exports}for(var f="function"==typeof require&&require,e=0;e<a.length;e++)s(a[e]);return s}({1:[function(n,o,r){!function(t){!function(){var e;"function"==typeof fetch&&(e=void 0!==t&&t.fetch?t.fetch:"undefined"!=typeof window&&window.fetch?window.fetch:fetch),void 0!==n&&"undefined"==typeof 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r.customHeaders?r.customHeaders():r.customHeaders)),u=("undefined"==typeof window&&void 0!==S&&void 0!==S.process&&S.process.versions&&S.process.versions.node&&(f["User-Agent"]="i18next-http-backend (node/".concat(S.process.version,"; ").concat(S.process.platform," ").concat(S.process.arch,")")),a&&(f["Content-Type"]="application/json"),"function"==typeof r.requestOptions?r.requestOptions(a):r.requestOptions),c=g({method:a?"POST":"GET",body:a?r.stringify(a):void 0,headers:f},P?{}:u),a="function"==typeof r.alternateFetch&&1<=r.alternateFetch.length?r.alternateFetch:void 0;try{j(i,c,s,a)}catch(e){if(!u||0===Object.keys(u).length||!e.message||e.message.indexOf("not implemented")<0)return s(e);try{Object.keys(u).forEach(function(e){delete c[e]}),j(i,c,s,a),P=!0}catch(e){s(e)}}}else if((0,m.hasXMLHttpRequest)()||"function"==typeof ActiveXObject){var f=e,r=t,u=n,l=o;u&&"object"===w(u)&&(u=O("",u).slice(1)),f.queryStringParams&&(r=O(r,f.queryStringParams));try{var d=b?new b:new v("MSXML2.XMLHTTP.3.0"),p=(d.open(u?"POST":"GET",r,1),f.crossDomain||d.setRequestHeader("X-Requested-With","XMLHttpRequest"),d.withCredentials=!!f.withCredentials,u&&d.setRequestHeader("Content-Type","application/x-www-form-urlencoded"),d.overrideMimeType&&d.overrideMimeType("application/json"),f.customHeaders);if(p="function"==typeof p?p():p)for(var y in p)d.setRequestHeader(y,p[y]);d.onreadystatechange=function(){3<d.readyState&&l(400<=d.status?d.statusText:null,{status:d.status,data:d.responseText})},d.send(u)}catch(e){console&&console.log(e)}}else o(new Error("No fetch and no xhr implementation found!"))};o.exports=r.default}.call(this)}.call(this,"undefined"!=typeof global?global:"undefined"!=typeof self?self:"undefined"!=typeof window?window:{})},{"./getFetch.js":1,"./utils.js":4}],4:[function(e,t,n){function o(e){return(o="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}Object.defineProperty(n,"__esModule",{value:!0}),n.defaults=function(n){return r.call(i.call(arguments,1),function(e){if(e)for(var t in e)void 0===n[t]&&(n[t]=e[t])}),n},n.hasXMLHttpRequest=function(){return"function"==typeof XMLHttpRequest||"object"===("undefined"==typeof XMLHttpRequest?"undefined":o(XMLHttpRequest))},n.makePromise=function(e){if((e=>e&&"function"==typeof e.then)(e))return e;return Promise.resolve(e)};var n=[],r=n.forEach,i=n.slice},{}],5:[function(e,t,n){},{}]},{},[2])(2)});
\ No newline at end of file
diff --git a/demo/trunk/node_modules/i18next-http-backend/lib/index.js b/demo/trunk/node_modules/i18next-http-backend/lib/index.js
index b6494944..d9999ae2 100644
--- a/demo/trunk/node_modules/i18next-http-backend/lib/index.js
+++ b/demo/trunk/node_modules/i18next-http-backend/lib/index.js
@@ -74,7 +74,7 @@ class Backend {
     this.options.request(this.options, url, payload, (err, res) => {
       if (res && ((res.status >= 500 && res.status < 600) || !res.status)) return callback('failed loading ' + url + '; status code: ' + res.status, true /* retry */)
       if (res && res.status >= 400 && res.status < 500) return callback('failed loading ' + url + '; status code: ' + res.status, false /* no retry */)
-      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 /* retry */)
+      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 /* retry */)
       if (err) return callback(err, false)
 
       let ret, parseErr
diff --git a/demo/trunk/node_modules/i18next-http-backend/package.json b/demo/trunk/node_modules/i18next-http-backend/package.json
index 3dbffa2b..d1b3dc25 100644
--- a/demo/trunk/node_modules/i18next-http-backend/package.json
+++ b/demo/trunk/node_modules/i18next-http-backend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "i18next-http-backend",
-  "version": "2.6.0",
+  "version": "2.6.1",
   "private": false,
   "type": "module",
   "main": "./cjs/index.js",
diff --git a/demo/trunk/yarn.lock b/demo/trunk/yarn.lock
index 571dc4a6..93814f71 100644
--- a/demo/trunk/yarn.lock
+++ b/demo/trunk/yarn.lock
@@ -26,10 +26,10 @@
   resolved "https://registry.yarnpkg.com/@eslint-community/regexpp/-/regexpp-4.11.0.tgz#b0ffd0312b4a3fd2d6f77237e7248a5ad3a680ae"
   integrity sha512-G/M/tIiMrTAxEWRfLfQJMmGNX28IxBg4PBz8XqQhqUHLFI6TL2htpIB1iQCj144V5ee/JaKyT9/WZ0MGZWfA7A==
 
-"@eslint/config-array@^0.17.1":
-  version "0.17.1"
-  resolved "https://registry.yarnpkg.com/@eslint/config-array/-/config-array-0.17.1.tgz#d9b8b8b6b946f47388f32bedfd3adf29ca8f8910"
-  integrity sha512-BlYOpej8AQ8Ev9xVqroV7a02JK3SkBAaN9GfMMH9W6Ch8FlQlkjGw4Ir7+FgYwfirivAf4t+GtzuAxqfukmISA==
+"@eslint/config-array@^0.18.0":
+  version "0.18.0"
+  resolved "https://registry.yarnpkg.com/@eslint/config-array/-/config-array-0.18.0.tgz#37d8fe656e0d5e3dbaea7758ea56540867fd074d"
+  integrity sha512-fTxvnS1sRMu3+JjXwJG0j/i4RT9u4qJ+lqS/yCGap4lH4zZGzQ7tu+xZqQmcMZq5OBZDL4QRxQzRjkWcGt8IVw==
   dependencies:
     "@eslint/object-schema" "^2.1.4"
     debug "^4.3.1"
@@ -50,10 +50,10 @@
     minimatch "^3.1.2"
     strip-json-comments "^3.1.1"
 
-"@eslint/js@9.9.0", "@eslint/js@^9.4.0":
-  version "9.9.0"
-  resolved "https://registry.yarnpkg.com/@eslint/js/-/js-9.9.0.tgz#d8437adda50b3ed4401964517b64b4f59b0e2638"
-  integrity sha512-hhetes6ZHP3BlXLxmd8K2SNgkhNSi+UcecbnwWKwpP7kyi/uC75DJ1lOOBO3xrC4jyojtGE3YxKZPHfk4yrgug==
+"@eslint/js@9.9.1", "@eslint/js@^9.4.0":
+  version "9.9.1"
+  resolved "https://registry.yarnpkg.com/@eslint/js/-/js-9.9.1.tgz#4a97e85e982099d6c7ee8410aacb55adaa576f06"
+  integrity sha512-xIDQRsfg5hNBqHz04H1R3scSVwmI+KUbqjsQKHKQ1DAUSaUjYPReZZmS/5PNiKu1fUvzDd6H7DEDKACSEhu+TQ==
 
 "@eslint/object-schema@^2.1.4":
   version "2.1.4"
@@ -92,19 +92,18 @@
     fastq "^1.6.0"
 
 "@stylistic/eslint-plugin-js@^2.1.0":
-  version "2.6.4"
-  resolved "https://registry.yarnpkg.com/@stylistic/eslint-plugin-js/-/eslint-plugin-js-2.6.4.tgz#52e2b89e1f0878aaeeca3be832287bc060d3a422"
-  integrity sha512-kx1hS3xTvzxZLdr/DCU/dLBE++vcP97sHeEFX2QXhk1Ipa4K1rzPOLw1HCbf4mU3s+7kHP5eYpDe+QteEOFLug==
+  version "2.7.2"
+  resolved "https://registry.yarnpkg.com/@stylistic/eslint-plugin-js/-/eslint-plugin-js-2.7.2.tgz#cf21cc843cd3011e9848072505bf61c491a415e7"
+  integrity sha512-PkwTDduCY6+ILlHNEfVT3BtShrtqrDJmyW3BW53PvCb+SHu7z88iReXbN+/uCr39fcP6qH49RA7RFsKRlpyMEQ==
   dependencies:
-    "@types/eslint" "^9.6.0"
-    acorn "^8.12.1"
+    "@types/eslint" "^9.6.1"
     eslint-visitor-keys "^4.0.0"
     espree "^10.1.0"
 
-"@types/eslint@^9.6.0":
-  version "9.6.0"
-  resolved "https://registry.yarnpkg.com/@types/eslint/-/eslint-9.6.0.tgz#51d4fe4d0316da9e9f2c80884f2c20ed5fb022ff"
-  integrity sha512-gi6WQJ7cHRgZxtkQEoyHMppPjq9Kxo5Tjn2prSKDSmZrCz8TZ3jSRCeTJm+WoM+oB0WG37bRqLzaaU3q7JypGg==
+"@types/eslint@^9.6.1":
+  version "9.6.1"
+  resolved "https://registry.yarnpkg.com/@types/eslint/-/eslint-9.6.1.tgz#d5795ad732ce81715f27f75da913004a56751584"
+  integrity sha512-FXx2pKgId/WyYo2jXw63kk7/+TY7u7AziEJxJAnSFzHlqTAS3Ync6SvgYAN/k4/PQpnnVuzoMuVnByKK2qp0ag==
   dependencies:
     "@types/estree" "*"
     "@types/json-schema" "*"
@@ -137,7 +136,7 @@ acorn-jsx@^5.3.2:
   resolved "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-5.3.2.tgz#7ed5bb55908b3b2f1bc55c6af1653bada7f07937"
   integrity sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==
 
-acorn@^8.12.0, acorn@^8.12.1:
+acorn@^8.12.0:
   version "8.12.1"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-8.12.1.tgz#71616bdccbe25e27a54439e0046e89ca76df2248"
   integrity sha512-tcpGyI9zbizT9JbV6oYE477V6mTlXvvi0T0G3SNIYE2apm/G5huBa1+K89VGeovbg+jycCrfhl3ADxErOuO6Jg==
@@ -243,7 +242,7 @@ brace-expansion@^1.1.7:
     balanced-match "^1.0.0"
     concat-map "0.0.1"
 
-braces@^3.0.1, braces@^3.0.2:
+braces@^3.0.3:
   version "3.0.3"
   resolved "https://registry.yarnpkg.com/braces/-/braces-3.0.3.tgz#490332f40919452272d55a8480adc0c441358789"
   integrity sha512-yQbXgO/OSZVD2IsiLlro+7Hf6Q18EJrKSEsdoMzKePKXct3gvD8oLcOQdIzGupr5Fj+EDe8gO/lxc1BzfMpxvA==
@@ -466,15 +465,15 @@ eslint-visitor-keys@^4.0.0:
   integrity sha512-OtIRv/2GyiF6o/d8K7MYKKbXrOUBIK6SfkIRM4Z0dY3w+LiQ0vy3F57m0Z71bjbyeiWFiHJ8brqnmE6H6/jEuw==
 
 eslint@^9.4.0:
-  version "9.9.0"
-  resolved "https://registry.yarnpkg.com/eslint/-/eslint-9.9.0.tgz#8d214e69ae4debeca7ae97daebbefe462072d975"
-  integrity sha512-JfiKJrbx0506OEerjK2Y1QlldtBxkAlLxT5OEcRF8uaQ86noDe2k31Vw9rnSWv+MXZHj7OOUV/dA0AhdLFcyvA==
+  version "9.9.1"
+  resolved "https://registry.yarnpkg.com/eslint/-/eslint-9.9.1.tgz#147ac9305d56696fb84cf5bdecafd6517ddc77ec"
+  integrity sha512-dHvhrbfr4xFQ9/dq+jcVneZMyRYLjggWjk6RVsIiHsP8Rz6yZ8LvZ//iU4TrZF+SXWG+JkNF2OyiZRvzgRDqMg==
   dependencies:
     "@eslint-community/eslint-utils" "^4.2.0"
     "@eslint-community/regexpp" "^4.11.0"
-    "@eslint/config-array" "^0.17.1"
+    "@eslint/config-array" "^0.18.0"
     "@eslint/eslintrc" "^3.1.0"
-    "@eslint/js" "9.9.0"
+    "@eslint/js" "9.9.1"
     "@humanwhocodes/module-importer" "^1.0.1"
     "@humanwhocodes/retry" "^0.3.0"
     "@nodelib/fs.walk" "^1.2.8"
@@ -982,9 +981,9 @@ i18next-browser-languagedetector@~8.0.0:
     "@babel/runtime" "^7.23.2"
 
 i18next-http-backend@~2.6.0:
-  version "2.6.0"
-  resolved "https://registry.yarnpkg.com/i18next-http-backend/-/i18next-http-backend-2.6.0.tgz#e2a2bc391b129c17d4918e9574962df6dc130327"
-  integrity sha512-WX5pXYNrAz2fj8ajsAuCIsogOEvJL+aHw4RTQAD/uqPoLV1FHqa6IsUULTfa3GtREVQbApp0U3woLhz9EuR2pQ==
+  version "2.6.1"
+  resolved "https://registry.yarnpkg.com/i18next-http-backend/-/i18next-http-backend-2.6.1.tgz#186c3a1359e10245c9119a13129f9b5bf328c9a7"
+  integrity sha512-rCilMAnlEQNeKOZY1+x8wLM5IpYOj10guGvEpeC59tNjj6MMreLIjIW8D1RclhD3ifLwn6d/Y9HEM1RUE6DSog==
   dependencies:
     cross-fetch "4.0.0"
 
@@ -1285,20 +1284,12 @@ map-cache@^0.2.0:
   resolved "https://registry.yarnpkg.com/map-cache/-/map-cache-0.2.2.tgz#c32abd0bd6525d9b051645bb4f26ac5dc98a0dbf"
   integrity sha1-wyq9C9ZSXZsFFkW7TyasXcmKDb8=
 
-micromatch@^4.0.2:
-  version "4.0.4"
-  resolved "https://registry.yarnpkg.com/micromatch/-/micromatch-4.0.4.tgz#896d519dfe9db25fce94ceb7a500919bf881ebf9"
-  integrity sha512-pRmzw/XUcwXGpD9aI9q/0XOwLNygjETJ8y0ao0wdqprrzDa4YnxLcz7fQRZr8voh8V10kGhABbNcHVk5wHgWwg==
+micromatch@^4.0.2, micromatch@^4.0.4:
+  version "4.0.8"
+  resolved "https://registry.yarnpkg.com/micromatch/-/micromatch-4.0.8.tgz#d66fa18f3a47076789320b9b1af32bd86d9fa202"
+  integrity sha512-PXwfBhYu0hBCPw8Dn0E+WDYb7af3dSLVWKi3HGv84IdF4TyFoC0ysxFd0Goxw7nSv4T/PzEJQxsYsEiFCKo2BA==
   dependencies:
-    braces "^3.0.1"
-    picomatch "^2.2.3"
-
-micromatch@^4.0.4:
-  version "4.0.5"
-  resolved "https://registry.yarnpkg.com/micromatch/-/micromatch-4.0.5.tgz#bc8999a7cbbf77cdc89f132f6e467051b49090c6"
-  integrity sha512-DMy+ERcEW2q8Z2Po+WNXuw3c5YaUSFjAO5GsJqfEl7UjvtIuFKO6ZrKvcItdy98dwFI2N1tg3zNIdKaQT+aNdA==
-  dependencies:
-    braces "^3.0.2"
+    braces "^3.0.3"
     picomatch "^2.3.1"
 
 mime-db@1.47.0:
@@ -1574,11 +1565,6 @@ path-root@^0.1.1:
   dependencies:
     path-root-regex "^0.1.0"
 
-picomatch@^2.2.3:
-  version "2.2.3"
-  resolved "https://registry.yarnpkg.com/picomatch/-/picomatch-2.2.3.tgz#465547f359ccc206d3c48e46a1bcb89bf7ee619d"
-  integrity sha512-KpELjfwcCDUb9PeigTs2mBJzXUPzAuP2oPcA989He8Rte0+YUAjw1JVedDhuTKPkHjSYzMN3npC9luThGYEKdg==
-
 picomatch@^2.3.1:
   version "2.3.1"
   resolved "https://registry.yarnpkg.com/picomatch/-/picomatch-2.3.1.tgz#3ba3833733646d9d3e4995946c1365a67fb07a42"