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Flutter: How to Refresh token when token expires to call？

Flutter是一种跨平台的移动应用开发框架，它可以帮助开发者使用单一代码库构建高性能、美观的iOS和Android应用。在Flutter中，当令牌过期时，可以通过以下步骤来刷新令牌并进行调用：

检测令牌是否过期：在每次调用需要令牌的API之前，可以先检查令牌的过期时间。通常，令牌会包含一个过期时间戳或有效期间。通过比较当前时间和令牌的过期时间，可以确定令牌是否已过期。
刷新令牌：如果令牌已过期，需要向服务器发送一个刷新令牌的请求。刷新令牌是一种获取新的访问令牌和更新令牌的过程。在请求中，需要包含旧的访问令牌和更新令牌。
更新令牌：服务器接收到刷新令牌请求后，会验证旧的访问令牌和更新令牌的有效性。如果验证通过，服务器会生成一个新的访问令牌和更新令牌，并将其返回给客户端。
更新本地存储的令牌：客户端收到新的访问令牌和更新令牌后，需要更新本地存储的令牌。这样，在下次调用API时，就可以使用新的访问令牌。

以下是一些推荐的腾讯云相关产品和产品介绍链接地址，可以用于实现令牌刷新的功能：

腾讯云移动推送：https://cloud.tencent.com/product/tpns
腾讯云API网关：https://cloud.tencent.com/product/apigateway
腾讯云身份认证服务：https://cloud.tencent.com/product/cam
腾讯云移动直播：https://cloud.tencent.com/product/mlvb

请注意，以上仅为示例链接，具体的产品选择应根据实际需求和项目要求进行评估和选择。同时，还可以根据具体的后端架构和认证授权机制，选择适合的腾讯云产品和解决方案来实现令牌刷新功能。

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