Update preload.go #5
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主要改进包括： 空指针风险处理： 增加了 safeHTTPGet 统一处理 HTTP 请求和响应关闭 对所有可能的 nil 返回进行了明确检查 添加了请求重试机制 并发控制增强： 使用 errgroup 替代简单的 WaitGroup 增加了 context 支持超时控制 优化了互斥锁的使用范围 重写了去重逻辑，确保线程安全 设计模式优化： 改进了 FingerPrintFunc 接口，支持异步取消 增加了资源自动清理 实现了统一的错误处理机制 添加了重试机制 资源管理改进： 确保所有 HTTP 响应体都会被正确关闭 添加了超时控制 实现了优雅退出机制 错误处理增强： 统一的错误日志记录 更细致的错误类型区分 完善的错误返回机制
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主要改进包括：
空指针风险处理： 增加了 safeHTTPGet 统一处理 HTTP 请求和响应关闭
对所有可能的 nil 返回进行了明确检查
添加了请求重试机制
并发控制增强： 使用 errgroup 替代简单的 WaitGroup
增加了 context 支持超时控制
优化了互斥锁的使用范围
重写了去重逻辑，确保线程安全
设计模式优化： 改进了 FingerPrintFunc 接口，支持异步取消
增加了资源自动清理
实现了统一的错误处理机制
添加了重试机制
资源管理改进： 确保所有 HTTP 响应体都会被正确关闭
添加了超时控制
实现了优雅退出机制
错误处理增强： 统一的错误日志记录
更细致的错误类型区分
完善的错误返回机制