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Support IE10/IE11 by responding to Pong frames #134

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commented Mar 12, 2014

IE10 and IE11sends pong frames and will disconnect if it doesn't receive a ping response:

IE console:

SCRIPT12030: WebSocket Error: Network Error 12030, The connection with the server 
was terminated abnormally

Http-kit log:

Wed Mar 12 14:18:47 CET 2014 [server-loop] WARN - not impl for opcode: 10

This "fix" sends a ping response on pong request (which according to the spec is optional).

  A Pong frame MAY be sent unsolicited.  This serves as a
   unidirectional heartbeat.  A response to an unsolicited Pong frame is
   not expected.

Section 5.5.3 -
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