is meta http-equiv value cache control is not supported?

The <meta http-equiv> tags are only used when the HTML file in question is been opened from a non-HTTP resource such as local disk file system (via file:// URI) and not when the HTML file in question is been opened from a real HTTP resource (via http:// URI). Instead, the real HTTP response headers as set via HttpServletResponse#setHeader() are been used.

So, your concrete problem is caused because those <meta http-equiv> tags are ignored.

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