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browsers for a very long time (maybe forever) so that there would be no incompatibility between clients and servers in next future;
* implementing HTTP/2 was considered a task of overwhelming complexity that could open the door to a whole new class of bugs that till 2015 did not exist and so it would have required notable investments in developing and testing the implementation of the new protocol;
* adding HTTP/2 support could always be done in future in case the

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