api: more informative request canceling #3881

Job	Run time
testing_mac_os (1.20, macos-12, brew)	5m 0s
run-tests-ce (1.20, 1.10, false, false)	4m 34s
testing_mac_os (1.20, macos-12, 1.10.15)	4m 53s
run-tests-ce (1.20, 2.8, false, false)	4m 22s
testing_mac_os (1.20, macos-14, brew)	3m 39s
testing_mac_os (stable, macos-12, brew)	5m 17s
testing_mac_os (stable, macos-12, 1.10.15)	6m 8s
run-tests-ce (1.20, 2.10, false, false)	4m 49s
testing_mac_os (stable, macos-14, brew)	3m 52s
run-tests-ce (1.20, master, false, false)	5m 5s
run-tests-ce (stable, 1.10, false, false)	4m 48s
run-tests-ce (stable, 2.8, false, false)	4m 40s
run-tests-ce (stable, 2.10, false, false)	4m 56s
run-tests-ce (stable, master, false, false)	5m 1s
run-tests-ce (master, true, 1.20)	5m 55s
run-tests-ce (master, true, 1.20, false)	5m 3s
	1h 18m 2s

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