diff --git a/.env.development b/.env.development
index 81b3be797..2614ca2cc 100644
--- a/.env.development
+++ b/.env.development
@@ -11,3 +11,8 @@ VITE_USE_LOCAL_PROXY=false
 VITE_STACK_PROJECT_ID=dummy_project_id
 VITE_STACK_PUBLISHABLE_CLIENT_KEY=dummy_publishable_key
 VITE_STACK_SECRET_SERVER_KEY=dummy_secret_server_key
+
+# HTTP proxy settings for local development
+# HTTP_PROXY=http://127.0.0.1:9090
+# HTTPS_PROXY=https://127.0.0.1:9090
+# NO_PROXY=localhost,127.0.0.1
\ No newline at end of file
diff --git a/electron/main/index.ts b/electron/main/index.ts
index b2001bbf0..8b3ab4392 100644
--- a/electron/main/index.ts
+++ b/electron/main/index.ts
@@ -52,6 +52,7 @@ import {
   getEmailFolderPath,
   getEnvPath,
   maskProxyUrl,
+  readEnvValueWithPriority,
   readGlobalEnvKey,
   removeEnvKey,
   updateEnvBlock,
@@ -138,11 +139,31 @@ app.commandLine.appendSwitch('enable-features', 'MemoryPressureReduction');
 app.commandLine.appendSwitch('renderer-process-limit', '8');
 
 // ==================== Proxy configuration ====================
-// Read proxy from global .env file on startup
-proxyUrl = readGlobalEnvKey('HTTP_PROXY');
+// Read proxy from multiple sources with priority:
+// 1. Process environment (inline: SET HTTP_PROXY=... && eigent.exe)
+// 2. .env.development (development mode)
+// 3. Global ~/.eigent/.env file
+// Check both HTTP_PROXY and HTTPS_PROXY (with lowercase variants)
+const httpProxy =
+  readEnvValueWithPriority('HTTP_PROXY') ||
+  readEnvValueWithPriority('http_proxy');
+const httpsProxy =
+  readEnvValueWithPriority('HTTPS_PROXY') ||
+  readEnvValueWithPriority('https_proxy');
+
+// Prefer HTTPS proxy if available, fallback to HTTP proxy
+proxyUrl = httpsProxy || httpProxy;
+
 if (proxyUrl) {
   log.info(`[PROXY] Applying proxy configuration: ${maskProxyUrl(proxyUrl)}`);
   app.commandLine.appendSwitch('proxy-server', proxyUrl);
+
+  // Log which proxy type is being used
+  if (httpsProxy) {
+    log.info('[PROXY] Using HTTPS_PROXY configuration');
+  } else if (httpProxy) {
+    log.info('[PROXY] Using HTTP_PROXY configuration');
+  }
 } else {
   log.info('[PROXY] No proxy configured');
 }
@@ -1159,17 +1180,39 @@ function registerIpcHandlers() {
       log.error('global env-remove error:', error);
     }
 
+    // Also remove from .env.development file (remove from anywhere in file, not just MCP block)
+    const DEV_ENV_PATH = path.join(process.cwd(), '.env.development');
+    try {
+      if (fs.existsSync(DEV_ENV_PATH)) {
+        let devContent = fs.readFileSync(DEV_ENV_PATH, 'utf-8');
+        let devLines = devContent.split(/\r?\n/);
+        // Remove key from anywhere in the file (not limited to MCP block)
+        devLines = devLines.filter((line) => !line.trim().startsWith(key + '='));
+        fs.writeFileSync(DEV_ENV_PATH, devLines.join('\n'), 'utf-8');
+        log.info(`env-remove: removed ${key} from .env.development`);
+      }
+    } catch (error) {
+      log.error('.env.development env-remove error:', error);
+    }
+
     return { success: true };
   });
 
   // ==================== read global env handler ====================
-  const ALLOWED_GLOBAL_ENV_KEYS = new Set(['HTTP_PROXY', 'HTTPS_PROXY']);
+  const ALLOWED_GLOBAL_ENV_KEYS = new Set([
+    'HTTP_PROXY',
+    'HTTPS_PROXY',
+    'NO_PROXY',
+    'http_proxy',
+    'https_proxy',
+    'no_proxy',
+  ]);
   ipcMain.handle('read-global-env', async (_event, key: string) => {
     if (!ALLOWED_GLOBAL_ENV_KEYS.has(key)) {
       log.warn(`[ENV] Blocked read of disallowed global env key: ${key}`);
       return { value: null };
     }
-    return { value: readGlobalEnvKey(key) };
+    return { value: readEnvValueWithPriority(key) };
   });
 
   // ==================== new window handler ====================
diff --git a/electron/main/init.ts b/electron/main/init.ts
index 57fb26c87..b60ce45ed 100644
--- a/electron/main/init.ts
+++ b/electron/main/init.ts
@@ -22,7 +22,7 @@ import os from 'os';
 import path from 'path';
 import { promisify } from 'util';
 import { PromiseReturnType } from './install-deps';
-import { maskProxyUrl, readGlobalEnvKey } from './utils/envUtil';
+import { maskProxyUrl, readEnvValueWithPriority } from './utils/envUtil';
 import {
   ensureTerminalVenvAtUserPath,
   findNodejsWheelBinPath,
@@ -42,7 +42,10 @@ const execAsync = promisify(exec);
 
 const DEFAULT_SERVER_URL = 'https://dev.eigent.ai/api';
 
-function readEnvValue(filePath: string, key: string): string | undefined {
+export function readEnvValue(
+  filePath: string,
+  key: string
+): string | undefined {
   try {
     if (!fs.existsSync(filePath)) return undefined;
     const content = fs.readFileSync(filePath, 'utf-8');
@@ -236,22 +239,22 @@ export async function startBackend(
   const uvEnv = getUvEnv(currentVersion);
   const globalEnvPath = path.join(os.homedir(), '.eigent', '.env');
 
-  // Load proxy configuration from global .env file
-  const proxyUrl = readGlobalEnvKey('HTTP_PROXY');
-
   // Build proxy env vars if configured
-  const proxyEnv = proxyUrl
-    ? {
-        HTTP_PROXY: proxyUrl,
-        HTTPS_PROXY: proxyUrl,
-        http_proxy: proxyUrl,
-        https_proxy: proxyUrl,
-      }
-    : {};
+  const proxyEnv = {
+    HTTP_PROXY: readEnvValueWithPriority('HTTP_PROXY'),
+    HTTPS_PROXY: readEnvValueWithPriority('HTTPS_PROXY'),
+    http_proxy: readEnvValueWithPriority('http_proxy'),
+    https_proxy: readEnvValueWithPriority('https_proxy'),
+    // Ensure local connections bypass proxy
+    NO_PROXY:
+      readEnvValueWithPriority('NO_PROXY') || 'localhost,127.0.0.1,.local',
+    no_proxy:
+      readEnvValueWithPriority('no_proxy') || 'localhost,127.0.0.1,.local',
+  };
 
-  if (proxyUrl) {
+  if (proxyEnv.HTTP_PROXY || proxyEnv.HTTPS_PROXY) {
     log.info(
-      `[BACKEND] Proxy configured for backend: ${maskProxyUrl(proxyUrl)}`
+      `[BACKEND] Proxy configured for backend: ${maskProxyUrl((proxyEnv.HTTP_PROXY || proxyEnv.HTTPS_PROXY) as string)}`
     );
   }
 
diff --git a/electron/main/utils/envUtil.ts b/electron/main/utils/envUtil.ts
index 565c8e017..c7e89b593 100644
--- a/electron/main/utils/envUtil.ts
+++ b/electron/main/utils/envUtil.ts
@@ -15,6 +15,7 @@
 import fs from 'fs';
 import os from 'os';
 import path from 'path';
+import { readEnvValue } from '../init';
 
 export const ENV_START = '# === MCP INTEGRATION ENV START ===';
 export const ENV_END = '# === MCP INTEGRATION ENV END ===';
@@ -116,6 +117,34 @@ export function readGlobalEnvKey(key: string): string | null {
   return null;
 }
 
+/**
+ * Read environment variable value with priority system.
+ *
+ * Priority order (highest to lowest):
+ * 1. Process environment variables (inline/system)
+ * 2. .env.development file (development mode only)
+ * 3. Global ~/.eigent/.env file
+ *
+ * @param key - The environment variable key to read
+ * @returns The value if found, null otherwise
+ */
+export function readEnvValueWithPriority(key: string): string | null {
+  // Priority 1: Process environment variables (highest priority)
+  if (process.env[key]) {
+    return process.env[key]!;
+  }
+
+  // Priority 2: .env.development file (development mode only)
+  if (process.env.NODE_ENV === 'development') {
+    const devEnvPath = path.join(process.cwd(), '.env.development');
+    const value = readEnvValue(devEnvPath, key);
+    if (value) return value;
+  }
+
+  // Priority 3: Global ~/.eigent/.env file
+  return readGlobalEnvKey(key);
+}
+
 /**
  * Mask credentials in a proxy URL for safe logging.
  * e.g. "http://user:pass@host:port" → "http://***:***@host:port"
diff --git a/electron/main/utils/process.ts b/electron/main/utils/process.ts
index 70fd11921..96d865a5c 100644
--- a/electron/main/utils/process.ts
+++ b/electron/main/utils/process.ts
@@ -18,6 +18,7 @@ import log from 'electron-log';
 import fs from 'fs';
 import os from 'os';
 import path from 'path';
+import { maskProxyUrl, readEnvValueWithPriority } from './envUtil';
 
 export function getResourcePath() {
   return path.join(app.getAppPath(), 'resources');
@@ -33,6 +34,69 @@ export function getBackendPath() {
   }
 }
 
+/**
+ * Get proxy environment variables with priority:
+ * 1. Process environment variables (inline/system)
+ * 2. .env.development file (development mode only)
+ * 3. Global ~/.eigent/.env config
+ *
+ * Returns an object with HTTP_PROXY, HTTPS_PROXY, NO_PROXY and lowercase variants
+ * if a proxy is configured, or an empty object if not.
+ * Supports separate HTTP and HTTPS proxy configurations.
+ */
+function getProxyEnvVars(): Record<string, string> {
+  // Check both uppercase and lowercase variants
+  const httpProxy =
+    readEnvValueWithPriority('HTTP_PROXY') ||
+    readEnvValueWithPriority('http_proxy');
+
+  const httpsProxy =
+    readEnvValueWithPriority('HTTPS_PROXY') ||
+    readEnvValueWithPriority('https_proxy');
+
+  // Return empty object if no proxy configured
+  if (!httpProxy && !httpsProxy) {
+    return {};
+  }
+
+  // Log configured proxies
+  if (httpProxy) {
+    log.info(
+      `[INSTALL SCRIPT] HTTP Proxy configured: ${maskProxyUrl(httpProxy)}`
+    );
+  }
+  if (httpsProxy) {
+    log.info(
+      `[INSTALL SCRIPT] HTTPS Proxy configured: ${maskProxyUrl(httpsProxy)}`
+    );
+  }
+
+  // Get NO_PROXY configuration (with default for local connections)
+  const noProxy = readEnvValueWithPriority('NO_PROXY') || 
+                  readEnvValueWithPriority('no_proxy') || 
+                  'localhost,127.0.0.1,.local';
+
+  // Return all variants (some tools need uppercase, others lowercase)
+  // Filter out undefined values
+  const result: Record<string, string> = {};
+
+  if (httpProxy) {
+    result.HTTP_PROXY = httpProxy;
+    result.http_proxy = httpProxy;
+  }
+
+  if (httpsProxy) {
+    result.HTTPS_PROXY = httpsProxy;
+    result.https_proxy = httpsProxy;
+  }
+
+  // Always set NO_PROXY when proxy is configured to avoid issues with local connections
+  result.NO_PROXY = noProxy;
+  result.no_proxy = noProxy;
+
+  return result;
+}
+
 export function runInstallScript(scriptPath: string): Promise<boolean> {
   return new Promise<boolean>((resolve, reject) => {
     const installScriptPath = path.join(
@@ -42,8 +106,15 @@ export function runInstallScript(scriptPath: string): Promise<boolean> {
     );
     log.info(`Running script at: ${installScriptPath}`);
 
+    // Get proxy configuration from global .env file
+    const proxyEnv = getProxyEnvVars();
+
     const nodeProcess = spawn(process.execPath, [installScriptPath], {
-      env: { ...process.env, ELECTRON_RUN_AS_NODE: '1' },
+      env: {
+        ...process.env,
+        ...proxyEnv,
+        ELECTRON_RUN_AS_NODE: '1',
+      },
     });
 
     let stderrOutput = '';
diff --git a/resources/scripts/download.js b/resources/scripts/download.js
index b527c6c8f..5b61b1e5c 100644
--- a/resources/scripts/download.js
+++ b/resources/scripts/download.js
@@ -12,13 +12,250 @@
 // limitations under the License.
 // ========= Copyright 2025-2026 @ Eigent.ai All Rights Reserved. =========
 
-/* global console, setTimeout, clearTimeout, require */
+/* global console, process */
 // @ts-check
 import fs from 'fs';
+import http from 'http';
 import https from 'https';
+import tls from 'tls';
+import { URL } from 'url';
 
 /**
- * Downloads a file from a URL with redirect handling
+ * Check if the target URL should bypass proxy based on NO_PROXY env var.
+ * @param {string} targetUrl - The target URL
+ * @returns {boolean} True if proxy should be bypassed
+ */
+function shouldBypassProxy(targetUrl) {
+  const noProxy = process.env.NO_PROXY || process.env.no_proxy;
+  if (!noProxy) return false;
+
+  try {
+    const targetHost = new URL(targetUrl).hostname.toLowerCase();
+    const noProxyList = noProxy.split(',').map((s) => s.trim().toLowerCase());
+
+    for (const pattern of noProxyList) {
+      if (!pattern) continue;
+      if (pattern === '*') return true;
+      if (targetHost === pattern) return true;
+      if (pattern.startsWith('.') && targetHost.endsWith(pattern)) return true;
+      if (targetHost.endsWith('.' + pattern)) return true;
+    }
+  } catch (error) {
+    console.warn(`Warning: Failed to parse NO_PROXY: ${error.message}`);
+  }
+  return false;
+}
+
+/**
+ * Get proxy URL from environment variables.
+ * @param {string} targetUrl - The target URL to determine which proxy to use
+ * @returns {string | null} The proxy URL or null if not configured
+ */
+function getProxyUrl(targetUrl) {
+  // Check NO_PROXY first
+  if (shouldBypassProxy(targetUrl)) {
+    return null;
+  }
+
+  const isHttps = targetUrl.startsWith('https://');
+
+  // Priority order for proxy env vars (check both uppercase and lowercase)
+  const envVars = isHttps
+    ? ['HTTPS_PROXY', 'https_proxy', 'HTTP_PROXY', 'http_proxy']
+    : ['HTTP_PROXY', 'http_proxy'];
+
+  for (const envVar of envVars) {
+    const value = process.env[envVar];
+    if (value && value.trim()) {
+      return value.trim();
+    }
+  }
+
+  return null;
+}
+
+/**
+ * Mask credentials in a proxy URL for safe logging.
+ * @param {string} url - The URL to mask
+ * @returns {string} The masked URL
+ */
+function maskProxyUrl(url) {
+  try {
+    const parsed = new URL(url);
+    if (parsed.username || parsed.password) {
+      parsed.username = parsed.username ? '***' : '';
+      parsed.password = parsed.password ? '***' : '';
+      return parsed.toString();
+    }
+  } catch (error) {
+    // Not a valid URL, return as-is
+    console.warn(`Warning: Failed to parse proxy URL: ${error.message}`);
+  }
+  return url;
+}
+
+/**
+ * Make an HTTP GET request with optional proxy support.
+ * For HTTPS URLs through HTTP proxy, uses CONNECT tunnel with TLS.
+ * @param {string} url - The URL to request
+ * @param {(response: http.IncomingMessage) => void} callback - Response callback
+ * @param {(error: Error) => void} onError - Error callback
+ */
+function makeRequest(url, callback, onError) {
+  const proxyUrl = getProxyUrl(url);
+  const isHttps = url.startsWith('https://');
+  const targetUrl = new URL(url);
+  const targetPort = parseInt(targetUrl.port, 10) || (isHttps ? 443 : 80);
+
+  if (!proxyUrl) {
+    // Direct connection (no proxy)
+    const httpModule = isHttps ? https : http;
+    const req = httpModule.get(url, callback);
+    req.on('error', onError);
+    return;
+  }
+
+  console.log(`Using proxy: ${maskProxyUrl(proxyUrl)}`);
+
+  const proxy = new URL(proxyUrl);
+  const proxyPort = parseInt(proxy.port, 10) || 80;
+
+  // Build proxy auth header if credentials provided
+  const proxyAuthHeader =
+    proxy.username || proxy.password
+      ? {
+          'Proxy-Authorization': `Basic ${Buffer.from(
+            `${decodeURIComponent(proxy.username || '')}:${decodeURIComponent(proxy.password || '')}`
+          ).toString('base64')}`,
+        }
+      : {};
+
+  if (isHttps) {
+    // HTTPS through HTTP proxy: Use CONNECT tunnel
+    const connectReq = http.request({
+      host: proxy.hostname,
+      port: proxyPort,
+      method: 'CONNECT',
+      path: `${targetUrl.hostname}:${targetPort}`,
+      headers: {
+        Host: `${targetUrl.hostname}:${targetPort}`,
+        ...proxyAuthHeader,
+      },
+    });
+
+    // Track resources for cleanup
+    let tlsSocket = null;
+    let httpsReq = null;
+
+    // Cleanup function to destroy all connections
+    const cleanup = () => {
+      if (httpsReq && !httpsReq.destroyed) {
+        httpsReq.destroy();
+      }
+      if (tlsSocket && !tlsSocket.destroyed) {
+        tlsSocket.destroy();
+      }
+      if (connectReq && !connectReq.destroyed) {
+        connectReq.destroy();
+      }
+    };
+
+    connectReq.on('connect', (res, socket) => {
+      if (res.statusCode !== 200) {
+        socket.destroy();
+        cleanup();
+        onError(
+          new Error(
+            `Proxy CONNECT failed with status ${res.statusCode}: ${res.statusMessage}`
+          )
+        );
+        return;
+      }
+
+      // Upgrade socket to TLS
+      tlsSocket = tls.connect(
+        {
+          host: targetUrl.hostname,
+          port: targetPort,
+          socket: socket,
+          servername: targetUrl.hostname, // SNI
+        },
+        () => {
+          // Make HTTPS request over TLS socket
+          httpsReq = https.request(
+            {
+              hostname: targetUrl.hostname,
+              port: targetPort,
+              path: targetUrl.pathname + targetUrl.search,
+              method: 'GET',
+              headers: { Host: targetUrl.host },
+              agent: false,
+              // Use createConnection to provide the pre-established TLS socket
+              createConnection: () => tlsSocket,
+            },
+            (response) => {
+              // Cleanup connections when response ends
+              response.on('end', cleanup);
+              response.on('close', cleanup);
+              callback(response);
+            }
+          );
+
+          httpsReq.on('error', (err) => {
+            cleanup();
+            onError(new Error(`HTTPS request error: ${err.message}`));
+          });
+
+          httpsReq.end();
+        }
+      );
+
+      tlsSocket.on('error', (err) => {
+        cleanup();
+        onError(new Error(`TLS connection error: ${err.message}`));
+      });
+    });
+
+    connectReq.on('error', (err) => {
+      cleanup();
+      onError(new Error(`Proxy connection error: ${err.message}`));
+    });
+
+    connectReq.setTimeout(30000, () => {
+      cleanup();
+      onError(new Error('Proxy connection timeout after 30 seconds'));
+    });
+
+    connectReq.end();
+  } else {
+    // HTTP through HTTP proxy: Use proxy as target with full URL as path
+    const req = http.request(
+      {
+        host: proxy.hostname,
+        port: proxyPort,
+        path: url, // Full URL for HTTP proxy
+        method: 'GET',
+        headers: {
+          Host: targetUrl.host,
+          ...proxyAuthHeader,
+        },
+      },
+      callback
+    );
+    req.on('error', (err) => {
+      onError(new Error(`HTTP proxy request error: ${err.message}`));
+    });
+    req.end();
+  }
+}
+
+/**
+ * Downloads a file from a URL with redirect handling and proxy support.
+ * Proxy is automatically detected from environment variables:
+ * - HTTPS_PROXY / https_proxy (for HTTPS URLs)
+ * - HTTP_PROXY / http_proxy (for HTTP URLs, or as fallback for HTTPS)
+ * - NO_PROXY / no_proxy (to bypass proxy for specific hosts)
+ *
  * @param {string} url The URL to download from
  * @param {string} destinationPath The path to save the file to
  * @returns {Promise<void>} Promise that resolves when download is complete
@@ -26,9 +263,7 @@ import https from 'https';
 export async function downloadWithRedirects(url, destinationPath) {
   return new Promise((resolve, reject) => {
     const timeoutMs = 10 * 60 * 1000; // 10 minutes
-    const timeout = setTimeout(() => {
-      reject(new Error(`timeout（${timeoutMs / 1000} seconds）`));
-    }, timeoutMs);
+    let timeoutId = null;
 
     // Use flag to prevent multiple resolve/reject calls
     let settled = false;
@@ -36,7 +271,7 @@ export async function downloadWithRedirects(url, destinationPath) {
     const safeReject = (error) => {
       if (!settled) {
         settled = true;
-        clearTimeout(timeout);
+        if (timeoutId) clearTimeout(timeoutId);
         reject(error);
       }
     };
@@ -44,17 +279,19 @@ export async function downloadWithRedirects(url, destinationPath) {
     const safeResolve = () => {
       if (!settled) {
         settled = true;
-        clearTimeout(timeout);
+        if (timeoutId) clearTimeout(timeoutId);
         resolve();
       }
     };
 
-    const request = (url) => {
-      // Support both http and https
-      const httpModule = url.startsWith('https://') ? https : require('http');
+    timeoutId = setTimeout(() => {
+      safeReject(new Error(`Download timeout after ${timeoutMs / 1000} seconds`));
+    }, timeoutMs);
 
-      httpModule
-        .get(url, (response) => {
+    const request = (requestUrl) => {
+      makeRequest(
+        requestUrl,
+        (response) => {
           const statusCode = response.statusCode || 0;
 
           // Handle redirects (301, 302, 307, 308)
@@ -63,15 +300,28 @@ export async function downloadWithRedirects(url, destinationPath) {
             statusCode <= 308 &&
             response.headers.location
           ) {
-            const redirectUrl = response.headers.location;
+            let redirectUrl = response.headers.location;
+
+            // Handle relative redirects
+            if (redirectUrl.startsWith('/')) {
+              try {
+                const originalUrl = new URL(requestUrl);
+                redirectUrl = `${originalUrl.protocol}//${originalUrl.host}${redirectUrl}`;
+              } catch (error) {
+                safeReject(new Error(`Failed to parse redirect URL: ${error.message}`));
+                return;
+              }
+            }
+
             console.log(`Following redirect to: ${redirectUrl}`);
             request(redirectUrl);
             return;
           }
+
           if (statusCode !== 200) {
             safeReject(
               new Error(
-                `Download failed: ${statusCode} ${response.statusMessage || 'Unknown error'}`
+                `Download failed with status ${statusCode}: ${response.statusMessage || 'Unknown error'}`
               )
             );
             return;
@@ -80,7 +330,8 @@ export async function downloadWithRedirects(url, destinationPath) {
           const file = fs.createWriteStream(destinationPath);
           let downloadedBytes = 0;
           const expectedBytes = parseInt(
-            response.headers['content-length'] || '0'
+            response.headers['content-length'] || '0',
+            10
           );
           const startTime = Date.now();
           let lastProgressTime = Date.now();
@@ -131,8 +382,10 @@ export async function downloadWithRedirects(url, destinationPath) {
                   if (fs.existsSync(destinationPath)) {
                     fs.unlinkSync(destinationPath);
                   }
-                } catch (err) {
-                  console.error('Failed to delete incomplete file:', err);
+                } catch (cleanupError) {
+                  console.warn(
+                    `Warning: Failed to delete incomplete file: ${cleanupError.message}`
+                  );
                 }
                 safeReject(
                   new Error(
@@ -155,9 +408,9 @@ export async function downloadWithRedirects(url, destinationPath) {
                 } else {
                   safeReject(new Error('Downloaded file does not exist'));
                 }
-              } catch (err) {
+              } catch (verifyError) {
                 safeReject(
-                  new Error(`Failed to verify download: ${err.message}`)
+                  new Error(`Failed to verify download: ${verifyError.message}`)
                 );
               }
             });
@@ -168,16 +421,18 @@ export async function downloadWithRedirects(url, destinationPath) {
               if (fs.existsSync(destinationPath)) {
                 fs.unlinkSync(destinationPath);
               }
-            } catch (deleteErr) {
-              console.error('Failed to delete file after error:', deleteErr);
+            } catch (cleanupError) {
+              console.warn(
+                `Warning: Failed to delete file after error: ${cleanupError.message}`
+              );
             }
-            safeReject(err);
+            safeReject(new Error(`File write error: ${err.message}`));
           });
-        })
-        .on('error', (err) => {
-          safeReject(err);
-        });
+        },
+        safeReject
+      );
     };
+
     request(url);
   });
 }
diff --git a/src/pages/Setting/General.tsx b/src/pages/Setting/General.tsx
index 435133d41..02cd199c5 100644
--- a/src/pages/Setting/General.tsx
+++ b/src/pages/Setting/General.tsx
@@ -77,6 +77,7 @@ export default function SettingGeneral() {
 
   // Proxy configuration state
   const [proxyUrl, setProxyUrl] = useState('');
+  const [loadedProxyUrl, setLoadedProxyUrl] = useState(''); // Track the initially loaded value
   const [isProxySaving, setIsProxySaving] = useState(false);
   const [proxyNeedsRestart, setProxyNeedsRestart] = useState(false);
 
@@ -158,16 +159,20 @@ export default function SettingGeneral() {
   ];
 
   useEffect(() => {
-    // Load proxy configuration from global env
+    // Load proxy configuration from env (with priority system)
     const loadProxyConfig = async () => {
       if (window.electronAPI?.readGlobalEnv) {
         try {
-          const result = await window.electronAPI.readGlobalEnv('HTTP_PROXY');
-          if (result?.value) {
-            setProxyUrl(result.value);
-          }
+          const result =
+            (await window.electronAPI.readGlobalEnv('HTTPS_PROXY')) ||
+            (await window.electronAPI.readGlobalEnv('HTTP_PROXY'));
+          const value = result?.value || '';
+          setProxyUrl(value);
+          setLoadedProxyUrl(value); // Remember the loaded value
         } catch (_error) {
           console.log('No proxy configured');
+          setProxyUrl('');
+          setLoadedProxyUrl('');
         }
       }
     };
@@ -229,6 +234,9 @@ export default function SettingGeneral() {
     }
   };
 
+  // Check if proxy value has changed from loaded value
+  const hasProxyChanged = proxyUrl.trim() !== loadedProxyUrl.trim();
+
   if (!chatStore) {
     return <div>Loading...</div>;
   }
@@ -372,22 +380,24 @@ export default function SettingGeneral() {
           size="default"
           note={proxyNeedsRestart ? t('setting.proxy-restart-hint') : undefined}
           trailingButton={
-            <Button
-              variant={proxyNeedsRestart ? 'outline' : 'primary'}
-              size="sm"
-              onClick={
-                proxyNeedsRestart
-                  ? () => window.electronAPI?.restartApp()
-                  : handleSaveProxy
-              }
-              disabled={!proxyNeedsRestart && isProxySaving}
-            >
-              {proxyNeedsRestart
-                ? t('setting.restart-to-apply')
-                : isProxySaving
-                  ? t('setting.saving')
-                  : t('setting.save')}
-            </Button>
+            proxyNeedsRestart ? (
+              <Button
+                variant="outline"
+                size="sm"
+                onClick={() => window.electronAPI?.restartApp()}
+              >
+                {t('setting.restart-to-apply')}
+              </Button>
+            ) : hasProxyChanged ? (
+              <Button
+                variant="primary"
+                size="sm"
+                onClick={handleSaveProxy}
+                disabled={isProxySaving}
+              >
+                {isProxySaving ? t('setting.saving') : t('setting.save')}
+              </Button>
+            ) : undefined
           }
         />
       </div>