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Specification: http://www.whatwg.org/specs/web-apps/current-work/multipage/network.html Multipage: http://www.whatwg.org/C#ping-and-pong-frames Complete: http://www.whatwg.org/c#ping-and-pong-frames Referrer: http://www.whatwg.org/specs/web-apps/current-work/multipage/network.html Comment: "User agents must not [ping/pong] to aid the server"?! Why not? Posted from: 2a02:390:a001:192:21c:c0ff:fe47:48f8 User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.22 (KHTML, like Gecko) Ubuntu Chromium/25.0.1364.160 Chrome/25.0.1364.160 Safari/537.22
Because it is assumed that servers will solicit pongs whenever appropriate for the server's needs.