injust commented on issue #1539: Will ngx_pagespeed affect the use of http / 2 server push? URL: https://github.com/apache/incubator-pagespeed-ngx/issues/1539#issuecomment-370177804 > The reasons we found were similar to those in the blog post, where in a bandwidth-constrained scenario you might actually block a critical resource with a non-critical one and make the experience worse. Worse, you may push a resource already in the browser cache. While request-cancellation might mitigate that partially, I'm skeptical it would really help in high-latency scenarios. By the time the cancel request reaches the server from the browser, it may have already sent everything. Outside of Apache and nginx, H2O has server push implemented with cache-awareness as well as push prioritization, which looks promising. I haven't experimented much with it, but cache-awareness looks to be a good way to get around the disadvantages of server push in high-latency situations.
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