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b6873c7a73
Since the batched prober replaced the single tester, the reported delay came from one cold request with keep-alives disabled, so it stacked the SOCKS handshake, proxy dial, proxy TLS, target TCP and target TLS on top of the round-trip. Users upgrading from v2.9.4 - whose tester warmed the connection first and timed a second request - saw several times the real connection time. The cold request still proves reachability and supplies the HTTP status plus the connect/TLS/TTFB breakdown; the delay is now re-measured on a second request over the kept-alive connection, falling back to the cold total when the warm request fails. Bodies are drained (bounded) so the connection returns to the pool, and the batch test asserts both requests of a probe share one connection.