http if modified since used only for static pages? -sharp-sharp-sharp problem description
http if modified since used only for static pages? -sharp-sharp-sharp problem description
1. The last update time of the file can only be obtained in seconds. If you modify it several times in a second, you may not be able to get the latest
2. The change in the last update time of the file does not mean that the file content is updated
3. If you need browser caching, you'd better use etag
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