diff --git a/backend/package.json b/backend/package.json
index ca46472..04617db 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sub-store",
-  "version": "2.19.74",
+  "version": "2.19.75",
   "description": "Advanced Subscription Manager for QX, Loon, Surge, Stash and Shadowrocket.",
   "main": "src/main.js",
   "scripts": {
diff --git a/backend/src/utils/download.js b/backend/src/utils/download.js
index e36e12d..a5add40 100644
--- a/backend/src/utils/download.js
+++ b/backend/src/utils/download.js
@@ -14,6 +14,8 @@ import $ from '@/core/app';
 import { findByName } from '@/utils/database';
 import { produceArtifact } from '@/restful/sync';
 import PROXY_PREPROCESSORS from '@/core/proxy-utils/preprocessors';
+import { ProxyUtils } from '@/core/proxy-utils';
+
 const clashPreprocessor = PROXY_PREPROCESSORS.find(
     (processor) => processor.name === 'Clash Pre-processor',
 );
@@ -261,10 +263,34 @@ export default async function download(
             if (shouldCache) {
                 resourceCache.set(id, body);
                 if (customCacheKey) {
-                    $.info(
-                        `URL ${url}\n写入自定义缓存 ${$arguments?.cacheKey}`,
-                    );
-                    $.write(body, customCacheKey);
+                    let shouldWriteCustomCacheKey = true;
+                    if (preprocess) {
+                        try {
+                            const proxies = ProxyUtils.parse(body);
+                            if (
+                                !Array.isArray(proxies) ||
+                                proxies.length === 0
+                            ) {
+                                $.error(
+                                    `URL ${url} 不包含有效节点\n不写入自定义缓存 ${$arguments?.cacheKey}`,
+                                );
+                                shouldWriteCustomCacheKey = false;
+                            }
+                        } catch (e) {
+                            $.error(
+                                `URL ${url} 尝试解析节点失败 ${
+                                    e.message ?? e
+                                }\n不写入自定义缓存 ${$arguments?.cacheKey}`,
+                            );
+                            shouldWriteCustomCacheKey = false;
+                        }
+                    }
+                    if (shouldWriteCustomCacheKey) {
+                        $.info(
+                            `URL ${url}\n写入自定义缓存 ${$arguments?.cacheKey}`,
+                        );
+                        $.write(body, customCacheKey);
+                    }
                 }
             }
 
diff --git a/backend/src/utils/flow.js b/backend/src/utils/flow.js
index e97805d..04feca2 100644
--- a/backend/src/utils/flow.js
+++ b/backend/src/utils/flow.js
@@ -334,7 +334,22 @@ export function normalizeFlowHeader(flowHeaders) {
                 if (!kvMap.has(key)) {
                     try {
                         // 解码 URI 组件并保留原始值作为 fallback
-                        const decodedValue = decodeURIComponent(encodedValue);
+                        let decodedValue = decodeURIComponent(encodedValue);
+                        if (
+                            ['upload', 'download', 'total', 'expire'].includes(
+                                key,
+                            )
+                        ) {
+                            try {
+                                decodedValue = Number(decodedValue).toFixed(0);
+                            } catch (e) {
+                                $.error(
+                                    `Failed to convert value for key "${key}=${encodedValue}": ${
+                                        e.message ?? e
+                                    }`,
+                                );
+                            }
+                        }
                         kvMap.set(key, decodedValue);
                     } catch (e) {
                         kvMap.set(key, encodedValue);