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我使用 httpServletResponse.setDateHeader("Expires", c.getTimeInMillis()); 为特定的 api 设置了过期时间。但是，当我进行 api 调用时，它似乎不起作用。每次进行 api 调用时，看起来定时缓存都不起作用。有什么帮助吗？