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This is entirely up the server and how it has been configured. Most servers are not intelligent enough to know what to push and depend on being configured. So you can set up config to say if any index.html file is requested then push common.css and common.js. It’s important then to consider the next page that’s visited - there is no need to push those files ...


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There is nothing wrong with that. Since your website resolves to both IPv4 and IPv6 addresses, the browser (or whatever HTTP client) at the other end may pick an address in random order, or prefer IPv6 over IPv4 (or the other way round). It may very well connect over IPv4 sometimes, and IPv6 at other times. The behavior has to be browser-specific and ...


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