api: more informative request canceling #3884

Job	Run time
testing_mac_os (1.20, macos-12, brew)	4m 50s
run-tests-ce (1.20, 1.10, false, false)	4m 16s
testing_mac_os (1.20, macos-12, 1.10.15)	4m 55s
run-tests-ce (1.20, 2.8, false, false)	4m 16s
testing_mac_os (1.20, macos-14, brew)	3m 40s
run-tests-ce (1.20, 2.10, false, false)	4m 43s
testing_mac_os (stable, macos-12, brew)	5m 1s
run-tests-ce (1.20, master, false, false)	12m 28s
testing_mac_os (stable, macos-12, 1.10.15)	4m 59s
run-tests-ce (stable, 1.10, false, false)	4m 43s
testing_mac_os (stable, macos-14, brew)	3m 48s
run-tests-ce (stable, 2.8, false, false)	4m 36s
run-tests-ce (stable, 2.10, false, false)	4m 42s
run-tests-ce (stable, master, false, false)	12m 26s
run-tests-ce (master, true, 1.20)	13m 4s
run-tests-ce (master, true, 1.20, false)	14m 15s
	1h 46m 42s

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