Github user bryancall commented on the issue:
https://github.com/apache/trafficserver/pull/761
I don't think it is a good idea to add another configuration value for
limiting connections. We already have proxy.config.net.max_connections_in for
limiting the number of connections in the LRU. It was managing the LRU size
when the new client sessions were created. It looks like that is still working
with SPDY, but might have been broken in HTTP/2 and HTTP/1.1.
I don't mind that we close the connection earlier in connection
establishment. There is an issue that the connection still can be closed by
the LRU later in the request even if no-throttle is configured on the
connecting port.
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