Do peaking of messages in polling transport:
Do peaking of messages in polling transport:

- if the transport readyState is `opening`, expect a PONG packet
- if we get close, abort ongoing requests

enounca/engine.io-client,julianduque/engine.io-client,hellpf/engine.io-client,juancancela/engine.io-client,socketio/engine.io-client,BernhardRode/engine.io-client,vedmalex/engine.io-client,AnyPresence/engine.io-client,juancarloscancela/engine.io-client,sanemat/engine.io-client,socketio/engine.io-client,lwahonen/engine.io-client,socketio/engine.io-client,gsklee/engine.io-client,nkzawa/engine.io-client,SpainTrain/engine.io-client,jskrzypek/engine.io-client,Automattic/engine.io-client