Fail fast on server-to-client requests in JSON-response mode instead of hanging #3721

Job	Run time
checks / pre-commit	54s
checks / readme-snippets	12s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 24s
checks / test (3.14, locked, ubuntu-latest)	1m 26s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 20s
checks / test (3.13, locked, windows-latest)	2m 5s
checks / test (3.11, lowest-direct, windows-latest)	2m 13s
checks / test (3.14, lowest-direct, windows-latest)	1m 59s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 30s
checks / test (3.12, locked, windows-latest)	2m 12s
checks / test (3.12, lowest-direct, windows-latest)	1m 56s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 33s
checks / docs	47s
checks / test (3.11, locked, ubuntu-latest)	1m 21s
checks / test (3.14, locked, windows-latest)	1m 52s
checks / test (3.11, locked, windows-latest)	1m 57s
checks / test (3.13, locked, ubuntu-latest)	1m 17s
checks / test (3.10, lowest-direct, windows-latest)	1m 57s
checks / test (3.10, locked, ubuntu-latest)	1m 29s
checks / test (3.12, locked, ubuntu-latest)	1m 42s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 27s
checks / test (3.13, lowest-direct, windows-latest)	2m 7s
checks / test (3.10, locked, windows-latest)	2m 13s
all-green	3s
	36m 56s

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