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What kind of change does this PR introduce?
aiohttp has introduced a change aio-libs/aiohttp#5056 in 3.7, to always check for transport is closing before deciding to reuse it.
What is the current behavior?
On High Load Occasion, a closing transport sometimes will be reused and such errors will be thrown aio-libs/aiohttp#4587
What is the new behavior?
The latest fix is to always check that transport is not closing before reusing it.
Does this PR introduce a breaking change?
No
Other information