[pull] master from DNSCrypt:master#263
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Try the rollover-sized certificate query over UDP first and return as soon as the small query succeeds so that a truncated response can trigger TCP fallback instead of waiting for large UDP probes to time out. We keep relayed UDP packets at the intended size after accounting for the Anonymized DNSCrypt header. When retrying through a relay over TCP, retain a rollover-sized inner query because the relay still forwards it to the resolver over UDP and applies the anti-amplification thing. Preserve the UDP RTT when TCP is used only to complete certificate retrieval, so resolver latency does not incorrectly appear to be the TCP fallback latency.
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