Sub2API v1.0 - AI API 网关(二开初始版本,基于上游 Wei-Shaw/sub2api)
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This commit is contained in:
李建琦
2026-08-21 18:30:13 +08:00
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# =============================================================================
# Sub2API Container Environment Configuration
# =============================================================================
# Copy this file to .env and modify as needed:
# cp .env.example .env
# chmod 600 .env
# nano .env
#
# Then start with Docker Compose or Apple container:
# docker compose up -d
# ./apple-container.sh up
# =============================================================================
# -----------------------------------------------------------------------------
# Server Configuration
# -----------------------------------------------------------------------------
# IPv4 bind address for host port mapping
BIND_HOST=0.0.0.0
# Server port exposed on the host (Apple container requires 1025-65535)
SERVER_PORT=8080
# Server mode: release or debug
SERVER_MODE=release
# Optional token used only for GitHub Release API update checks. Release asset
# downloads remain anonymous. GITHUB_TOKEN and GH_TOKEN are not used.
UPDATE_GITHUB_TOKEN=
# Return Server-Timing for authenticated requests made by the Admin web UI
ENABLE_SERVER_TIMING=false
# Apple container image overrides (ignored by Docker Compose). Pin release tags
# or digests for repeatable operator-managed deployments.
APPLE_CONTAINER_SUB2API_IMAGE=weishaw/sub2api:latest
APPLE_CONTAINER_POSTGRES_IMAGE=postgres:18-alpine
APPLE_CONTAINER_REDIS_IMAGE=redis:8-alpine
# -----------------------------------------------------------------------------
# Logging Configuration
# 日志配置
# -----------------------------------------------------------------------------
# 日志级别:debug/info/warn/error
LOG_LEVEL=info
# 日志格式:json/console
LOG_FORMAT=json
# 每条日志附带的 service 字段
LOG_SERVICE_NAME=sub2api
# 每条日志附带的 env 字段
LOG_ENV=production
# 是否输出调用方位置信息
LOG_CALLER=true
# 堆栈输出阈值:none/error/fatal
LOG_STACKTRACE_LEVEL=error
# 输出开关(建议容器内保持双输出)
# 是否输出到 stdout/stderr
LOG_OUTPUT_TO_STDOUT=true
# 是否输出到文件
LOG_OUTPUT_TO_FILE=true
# 日志文件路径(留空自动推导):
# - 设置 DATA_DIR${DATA_DIR}/logs/sub2api.log
# - 未设置 DATA_DIR/app/data/logs/sub2api.log
LOG_OUTPUT_FILE_PATH=
# 滚动配置
# 单文件最大体积(MB
LOG_ROTATION_MAX_SIZE_MB=100
# 保留历史文件数量(0 表示不限制)
LOG_ROTATION_MAX_BACKUPS=10
# 历史日志保留天数(0 表示不限制)
LOG_ROTATION_MAX_AGE_DAYS=7
# 是否压缩历史日志
LOG_ROTATION_COMPRESS=true
# 滚动文件时间戳是否使用本地时间
LOG_ROTATION_LOCAL_TIME=true
# 采样配置(高频重复日志降噪)
LOG_SAMPLING_ENABLED=false
# 每秒前 N 条日志不采样
LOG_SAMPLING_INITIAL=100
# 之后每 N 条保留 1 条
LOG_SAMPLING_THEREAFTER=100
# Global max request body size in bytes (default: 256MB)
# 全局最大请求体大小(字节,默认 256MB)
# Applies to all requests, especially important for h2c first request memory protection
# 适用于所有请求,对 h2c 第一请求的内存保护尤为重要
SERVER_MAX_REQUEST_BODY_SIZE=268435456
# Gateway max request body size in bytes (default: 256MB)
# 网关请求体最大字节数(默认 256MB)
GATEWAY_MAX_BODY_SIZE=268435456
# Enable HTTP/2 Cleartext (h2c) for client connections
# 启用 HTTP/2 Cleartext (h2c) 客户端连接
SERVER_H2C_ENABLED=true
# H2C max concurrent streams (default: 50)
# H2C 最大并发流数量(默认 50)
SERVER_H2C_MAX_CONCURRENT_STREAMS=50
# H2C idle timeout in seconds (default: 75)
# H2C 空闲超时时间(秒,默认 75)
SERVER_H2C_IDLE_TIMEOUT=75
# H2C max read frame size in bytes (default: 1048576 = 1MB)
# H2C 最大帧大小(字节,默认 1048576 = 1MB
SERVER_H2C_MAX_READ_FRAME_SIZE=1048576
# H2C max upload buffer per connection in bytes (default: 2097152 = 2MB)
# H2C 每个连接的最大上传缓冲区(字节,默认 2097152 = 2MB
SERVER_H2C_MAX_UPLOAD_BUFFER_PER_CONNECTION=2097152
# H2C max upload buffer per stream in bytes (default: 524288 = 512KB)
# H2C 每个流的最大上传缓冲区(字节,默认 524288 = 512KB
SERVER_H2C_MAX_UPLOAD_BUFFER_PER_STREAM=524288
# 运行模式: standard (默认) 或 simple (内部自用)
# standard: 完整 SaaS 功能,包含计费/余额校验;simple: 隐藏 SaaS 功能并跳过计费/余额校验
RUN_MODE=standard
# Timezone
TZ=Asia/Shanghai
# Optional mobile Alipay flow. Unset uses the value saved in Admin Settings.
# Enable only for official Alipay instances with face-to-face payment enabled.
# ALIPAY_MOBILE_PRECREATE_DEEP_LINK=true
# -----------------------------------------------------------------------------
# PostgreSQL Configuration (REQUIRED)
# -----------------------------------------------------------------------------
POSTGRES_USER=sub2api
POSTGRES_PASSWORD=change_this_secure_password
POSTGRES_DB=sub2api
# PostgreSQL 监听端口(同时用于 PG 服务端和应用连接,默认 5432)
DATABASE_PORT=5432
# -----------------------------------------------------------------------------
# PostgreSQL 服务端参数(可选)
# -----------------------------------------------------------------------------
# POSTGRES_MAX_CONNECTIONSPostgreSQL 服务端允许的最大连接数。
# 必须 >=(所有 Sub2API 实例的 DATABASE_MAX_OPEN_CONNS 之和)+ 预留余量(例如 20%)。
POSTGRES_MAX_CONNECTIONS=1024
# POSTGRES_SHARED_BUFFERSPostgreSQL 用于缓存数据页的共享内存。
# 常见建议:物理内存的 10%~25%(容器内存受限时请按实际限制调整)。
# 8GB 内存容器参考:1GB。
POSTGRES_SHARED_BUFFERS=1GB
# POSTGRES_EFFECTIVE_CACHE_SIZE:查询规划器“假设可用的 OS 缓存大小”(不等于实际分配)。
# 常见建议:物理内存的 50%~75%。
# 8GB 内存容器参考:6GB。
POSTGRES_EFFECTIVE_CACHE_SIZE=4GB
# POSTGRES_MAINTENANCE_WORK_MEM:维护操作内存(VACUUM/CREATE INDEX 等)。
# 值越大维护越快,但会占用更多内存。
# 8GB 内存容器参考:128MB。
POSTGRES_MAINTENANCE_WORK_MEM=128MB
# -----------------------------------------------------------------------------
# PostgreSQL 连接池参数(可选,默认与程序内置一致)
# -----------------------------------------------------------------------------
# 说明:
# - 这些参数控制 Sub2API 进程到 PostgreSQL 的连接池大小(不是 PostgreSQL 自身的 max_connections)。
# - 多实例/多副本部署时,总连接上限约等于:实例数 * DATABASE_MAX_OPEN_CONNS。
# - 连接池过大可能导致:数据库连接耗尽、内存占用上升、上下文切换增多,反而变慢。
# - 建议结合 PostgreSQL 的 max_connections 与机器规格逐步调优:
# 通常把应用总连接上限控制在 max_connections 的 50%~80% 更稳妥。
#
# DATABASE_MAX_OPEN_CONNS:最大打开连接数(活跃+空闲),达到后新请求会等待可用连接。
# 典型范围:50~500(取决于 DB 规格、实例数、SQL 复杂度)。
DATABASE_MAX_OPEN_CONNS=256
# DATABASE_MAX_IDLE_CONNS:最大空闲连接数(热连接),建议 <= MAX_OPEN。
# 太小会频繁建连增加延迟;太大会长期占用数据库资源。
DATABASE_MAX_IDLE_CONNS=128
# DATABASE_CONN_MAX_LIFETIME_MINUTES:单个连接最大存活时间(单位:分钟)。
# 用于避免连接长期不重建导致的中间件/LB/NAT 异常或服务端重启后的“僵尸连接”。
# 设置为 0 表示不限制(一般不建议生产环境)。
DATABASE_CONN_MAX_LIFETIME_MINUTES=30
# DATABASE_CONN_MAX_IDLE_TIME_MINUTES:空闲连接最大存活时间(单位:分钟)。
# 超过该时间的空闲连接会被回收,防止长时间闲置占用连接数。
# 设置为 0 表示不限制(一般不建议生产环境)。
DATABASE_CONN_MAX_IDLE_TIME_MINUTES=5
# -----------------------------------------------------------------------------
# Redis Configuration
# -----------------------------------------------------------------------------
# Redis 监听端口(同时用于应用连接和 Redis 服务端,默认 6379)
REDIS_PORT=6379
# Redis ACL username; leave empty for the default user
REDIS_USERNAME=
# Leave empty for no password (default for local development)
REDIS_PASSWORD=
REDIS_DB=0
# Redis 服务端最大客户端连接数(可选)
REDIS_MAXCLIENTS=50000
# Redis 连接池大小(默认 1024)
REDIS_POOL_SIZE=4096
# Redis 最小空闲连接数(默认 10)
REDIS_MIN_IDLE_CONNS=256
REDIS_ENABLE_TLS=false
# -----------------------------------------------------------------------------
# Admin Account
# -----------------------------------------------------------------------------
# Email for the admin account
ADMIN_EMAIL=admin@sub2api.local
# Password for admin account
# Leave empty to auto-generate (will be shown in logs on first run)
ADMIN_PASSWORD=
# -----------------------------------------------------------------------------
# JWT Configuration
# -----------------------------------------------------------------------------
# IMPORTANT: Set a fixed JWT_SECRET to prevent login sessions from being
# invalidated after container restarts. If left empty, a random secret will
# be generated on each startup, causing all users to be logged out.
# Generate a secure secret: openssl rand -hex 32
JWT_SECRET=
JWT_EXPIRE_HOUR=24
# Access Token 有效期(分钟)
# 优先级说明:
# - >0: 按分钟生效(优先于 JWT_EXPIRE_HOUR
# - =0: 回退使用 JWT_EXPIRE_HOUR
JWT_ACCESS_TOKEN_EXPIRE_MINUTES=0
# -----------------------------------------------------------------------------
# Setup Configuration
# -----------------------------------------------------------------------------
# Database migration timeout during initial setup, in seconds.
# Leave 0 to use the built-in default of 60 seconds.
SETUP_MIGRATION_TIMEOUT_SECONDS=0
# -----------------------------------------------------------------------------
# TOTP (2FA) Configuration
# TOTP(双因素认证)配置
# -----------------------------------------------------------------------------
# IMPORTANT: Set a fixed encryption key for TOTP secrets. If left empty, a
# random key will be generated on each startup, causing all existing TOTP
# configurations to become invalid (users won't be able to login with 2FA).
# Generate a secure key: openssl rand -hex 32
# 重要:设置固定的 TOTP 加密密钥。如果留空,每次启动将生成随机密钥,
# 导致现有的 TOTP 配置失效(用户无法使用双因素认证登录)。
TOTP_ENCRYPTION_KEY=
# -----------------------------------------------------------------------------
# Configuration File (Optional)
# -----------------------------------------------------------------------------
# Path to custom config file (relative to docker-compose.yml directory)
# Copy config.example.yaml to config.yaml and modify as needed
# Leave unset to use default ./config.yaml
#CONFIG_FILE=./config.yaml
# -----------------------------------------------------------------------------
# Built-in OAuth Client Secrets (Optional)
# -----------------------------------------------------------------------------
# SECURITY NOTE:
# - 本项目不会在代码仓库中内置第三方 OAuth client_secret。
# - 如需使用“内置客户端”(而不是自建 OAuth Client),请在运行环境通过 env 注入。
#
# Gemini CLI built-in OAuth client_secret(用于 Gemini code_assist/google_one 内置登录流)
# GEMINI_CLI_OAUTH_CLIENT_SECRET=
#
# Antigravity OAuth client_secret(用于 Antigravity OAuth 登录流)
# ANTIGRAVITY_OAUTH_CLIENT_SECRET=
#
# Antigravity User-Agent 版本号(后台设置 antigravity_user_agent_version 优先;留空使用内置默认 1.23.2)
# ANTIGRAVITY_USER_AGENT_VERSION=
# -----------------------------------------------------------------------------
# Rate Limiting (Optional)
# 速率限制(可选)
# -----------------------------------------------------------------------------
# Cooldown time (in minutes) when upstream returns 529 (overloaded)
# 上游返回 529(过载)时的冷却时间(分钟)
RATE_LIMIT_OVERLOAD_COOLDOWN_MINUTES=10
# -----------------------------------------------------------------------------
# Gateway Scheduling (Optional)
# 调度缓存与受控回源配置(缓存就绪且命中时不读 DB)
# -----------------------------------------------------------------------------
# Force Codex CLI mode: treat all /openai/v1/responses requests as Codex CLI.
# 强制按 Codex CLI 处理 /openai/v1/responses 请求(用于网关未透传/改写 User-Agent 的兜底)。
#
# 注意:开启后会影响所有客户端的行为(不仅限于 VS Code / Codex CLI),请谨慎开启。
#
# 默认:false
GATEWAY_FORCE_CODEX_CLI=false
# OpenAI /responses/compact 上游模型(默认 gpt-5.4)。
# 当 compact 端点暂未支持更新模型时,可通过这里降级规避失败。
GATEWAY_OPENAI_COMPACT_MODEL=gpt-5.4
# OpenAI/Codex 等待上游响应头超时(秒);0 表示不使用本地响应头超时截断。
GATEWAY_OPENAI_RESPONSE_HEADER_TIMEOUT=0
# OpenAI HTTP 上游默认启用 HTTP/2;如需紧急回滚可设为 false。
GATEWAY_OPENAI_HTTP2_ENABLED=true
GATEWAY_OPENAI_HTTP2_ALLOW_PROXY_FALLBACK_TO_HTTP1=true
GATEWAY_OPENAI_HTTP2_FALLBACK_ERROR_THRESHOLD=2
GATEWAY_OPENAI_HTTP2_FALLBACK_WINDOW_SECONDS=60
GATEWAY_OPENAI_HTTP2_FALLBACK_TTL_SECONDS=600
GATEWAY_OPENAI_PROXY_STREAM_CIRCUIT_FAILURE_THRESHOLD=2
GATEWAY_OPENAI_PROXY_STREAM_CIRCUIT_WINDOW_SECONDS=60
GATEWAY_OPENAI_PROXY_STREAM_CIRCUIT_TTL_SECONDS=600
# 上游连接池:每主机最大连接数(默认 1024;流式/HTTP1.1 场景可调大,如 2400/4096
GATEWAY_MAX_CONNS_PER_HOST=2048
# 上游连接池:最大空闲连接总数(默认 2560;账号/代理隔离 + 高并发场景可调大)
GATEWAY_MAX_IDLE_CONNS=8192
# 上游连接池:每主机最大空闲连接(默认 120)
GATEWAY_MAX_IDLE_CONNS_PER_HOST=4096
# 粘性会话最大排队长度
GATEWAY_SCHEDULING_STICKY_SESSION_MAX_WAITING=3
# 粘性会话等待超时(时间段,例如 45s)
GATEWAY_SCHEDULING_STICKY_SESSION_WAIT_TIMEOUT=120s
# 兜底排队等待超时(时间段,例如 30s)
GATEWAY_SCHEDULING_FALLBACK_WAIT_TIMEOUT=30s
# 兜底最大排队长度
GATEWAY_SCHEDULING_FALLBACK_MAX_WAITING=100
# 启用调度批量负载计算
GATEWAY_SCHEDULING_LOAD_BATCH_ENABLED=true
# 并发槽位清理周期(时间段,例如 30s)
GATEWAY_SCHEDULING_SLOT_CLEANUP_INTERVAL=30s
# 是否允许受控回源到 DB(默认 true,保持现有行为)
GATEWAY_SCHEDULING_DB_FALLBACK_ENABLED=true
# 受控回源超时(秒),0 表示不额外收紧超时
GATEWAY_SCHEDULING_DB_FALLBACK_TIMEOUT_SECONDS=0
# 受控回源限流(实例级 QPS),0 表示不限制
GATEWAY_SCHEDULING_DB_FALLBACK_MAX_QPS=0
# outbox 轮询周期(秒)
GATEWAY_SCHEDULING_OUTBOX_POLL_INTERVAL_SECONDS=1
# outbox 滞后告警阈值(秒)
GATEWAY_SCHEDULING_OUTBOX_LAG_WARN_SECONDS=5
# outbox 触发强制重建阈值(秒)
GATEWAY_SCHEDULING_OUTBOX_LAG_REBUILD_SECONDS=10
# outbox 连续滞后触发次数
GATEWAY_SCHEDULING_OUTBOX_LAG_REBUILD_FAILURES=3
# outbox 积压触发重建阈值(行数)
GATEWAY_SCHEDULING_OUTBOX_BACKLOG_REBUILD_ROWS=10000
# 全量重建周期(秒)
GATEWAY_SCHEDULING_FULL_REBUILD_INTERVAL_SECONDS=300
# -----------------------------------------------------------------------------
# Image Generation Keepalive & Concurrency (Optional)
# 图片生成保活与并发隔离配置(可选)
# -----------------------------------------------------------------------------
# 图片流式上游数据间隔超时(秒)。0 表示禁用;非 0 时必须为 60-1800。
GATEWAY_IMAGE_STREAM_DATA_INTERVAL_TIMEOUT=900
# 图片流式 keepalive 间隔(秒)。0 表示禁用;非 0 时必须为 5-60。
GATEWAY_IMAGE_STREAM_KEEPALIVE_INTERVAL=10
# 图片非流式 JSON keepalive 间隔(秒)。默认 0 禁用;首个心跳后 HTTP 状态会固化为 200。
GATEWAY_IMAGE_NONSTREAM_KEEPALIVE_INTERVAL=0
# 是否启用进程级图片生成并发限制。默认 false,保持历史行为。
GATEWAY_IMAGE_CONCURRENCY_ENABLED=false
# 当前进程允许同时处理的图片生成请求数。0 表示不限制。
GATEWAY_IMAGE_CONCURRENCY_MAX_CONCURRENT_REQUESTS=0
# 图片并发超限策略:reject 直接返回 429;wait 等待空闲槽位。
GATEWAY_IMAGE_CONCURRENCY_OVERFLOW_MODE=reject
# wait 模式下等待空闲图片槽位的最长时间(秒)。
GATEWAY_IMAGE_CONCURRENCY_WAIT_TIMEOUT_SECONDS=30
# wait 模式下当前进程允许排队等待的最大图片请求数。0 表示不允许等待队列。
GATEWAY_IMAGE_CONCURRENCY_MAX_WAITING_REQUESTS=100
# -----------------------------------------------------------------------------
# Dashboard Aggregation (Optional)
# -----------------------------------------------------------------------------
# Enable aggregation job
# 启用仪表盘预聚合
DASHBOARD_AGGREGATION_ENABLED=true
# Refresh interval (seconds)
# 刷新间隔(秒)
DASHBOARD_AGGREGATION_INTERVAL_SECONDS=60
# Lookback window (seconds)
# 回看窗口(秒)
DASHBOARD_AGGREGATION_LOOKBACK_SECONDS=120
# Allow manual backfill
# 允许手动回填
DASHBOARD_AGGREGATION_BACKFILL_ENABLED=false
# Backfill max range (days)
# 回填最大跨度(天)
DASHBOARD_AGGREGATION_BACKFILL_MAX_DAYS=31
# Recompute recent N days on startup
# 启动时重算最近 N 天
DASHBOARD_AGGREGATION_RECOMPUTE_DAYS=2
# Retention windows (days)
# 保留窗口(天)
DASHBOARD_AGGREGATION_RETENTION_USAGE_LOGS_DAYS=90
DASHBOARD_AGGREGATION_RETENTION_HOURLY_DAYS=180
DASHBOARD_AGGREGATION_RETENTION_DAILY_DAYS=730
# -----------------------------------------------------------------------------
# Security Configuration
# -----------------------------------------------------------------------------
# URL Allowlist Configuration
# 启用 URL 白名单验证(false 则跳过白名单检查,仅做基本格式校验)
SECURITY_URL_ALLOWLIST_ENABLED=false
# 关闭白名单时,是否允许 http:// URL(默认 true,设为 false 则只允许 https://
# ⚠️ 警告:允许 HTTP 存在安全风险(明文传输),生产环境建议设为 false
# Allow insecure HTTP URLs when allowlist is disabled (default: true; set to false to require https)
# ⚠️ WARNING: Allowing HTTP has security risks (plaintext transmission)
# Recommended to set false in production
SECURITY_URL_ALLOWLIST_ALLOW_INSECURE_HTTP=true
# 是否允许本地/私有 IP 地址用于上游/定价/CRS(仅在可信网络中使用)
# Allow localhost/private IPs for upstream/pricing/CRS (use only in trusted networks)
SECURITY_URL_ALLOWLIST_ALLOW_PRIVATE_HOSTS=true
# -----------------------------------------------------------------------------
# Gemini OAuth (OPTIONAL, required only for Gemini OAuth accounts)
# -----------------------------------------------------------------------------
# Sub2API supports TWO Gemini OAuth modes:
#
# 1. Code Assist OAuth (需要 GCP project_id)
# - Uses: cloudcode-pa.googleapis.com (Code Assist API)
# - Auto scopes: cloud-platform + userinfo.email + userinfo.profile
# - OAuth Client: Can use built-in Gemini CLI client (留空即可)
# - Requires: Google Cloud Platform project with Code Assist enabled
#
# 2. AI Studio OAuth (不需要 project_id)
# - Uses: generativelanguage.googleapis.com (AI Studio API)
# - Default scopes: generative-language
# - OAuth Client: Requires your own OAuth 2.0 Client (内置 Gemini CLI client 不能申请 generative-language scope)
# - Requires: Create OAuth 2.0 Client in GCP Console + OAuth consent screen
# - Setup Guide: https://ai.google.dev/gemini-api/docs/oauth
# - ⚠️ IMPORTANT: OAuth Client 必须发布为正式版本 (Production)
# Testing 模式限制: 只能添加 100 个测试用户, refresh token 7 天后过期
# 发布步骤: GCP Console → OAuth consent screen → PUBLISH APP
#
# Configuration:
# Leave empty to use the built-in Gemini CLI OAuth client (Code Assist OAuth only).
# To enable AI Studio OAuth, set your own OAuth client ID/secret here.
GEMINI_OAUTH_CLIENT_ID=
GEMINI_OAUTH_CLIENT_SECRET=
# Optional; leave empty to auto-select scopes based on oauth_type
GEMINI_OAUTH_SCOPES=
# -----------------------------------------------------------------------------
# Gemini Quota Policy (OPTIONAL, local simulation)
# -----------------------------------------------------------------------------
# JSON overrides for local quota simulation (Code Assist only).
# Example:
# GEMINI_QUOTA_POLICY={"tiers":{"LEGACY":{"pro_rpd":50,"flash_rpd":1500,"cooldown_minutes":30},"PRO":{"pro_rpd":1500,"flash_rpd":4000,"cooldown_minutes":5},"ULTRA":{"pro_rpd":2000,"flash_rpd":0,"cooldown_minutes":5}}}
GEMINI_QUOTA_POLICY=
# -----------------------------------------------------------------------------
# Ops Monitoring Configuration (运维监控配置)
# -----------------------------------------------------------------------------
# Enable ops monitoring features (background jobs and APIs)
# 是否启用运维监控功能(后台任务和接口)
# Set to false to hide ops menu in sidebar and disable all ops features
# 设置为 false 可在左侧栏隐藏运维监控菜单并禁用所有运维监控功能
OPS_ENABLED=true
# -----------------------------------------------------------------------------
# Update Configuration (在线更新配置)
# -----------------------------------------------------------------------------
# Proxy URL for accessing GitHub (used for online updates and pricing data)
# 用于访问 GitHub 的代理地址(用于在线更新和定价数据获取)
# Supports: http, https, socks5, socks5h
# Examples:
# HTTP proxy: http://127.0.0.1:7890
# SOCKS5 proxy: socks5://127.0.0.1:1080
# With authentication: http://user:pass@proxy.example.com:8080
# Leave empty for direct connection (recommended for overseas servers)
# 留空表示直连(适用于海外服务器)
UPDATE_PROXY_URL=