Enable ForceAttemptHTTP2 on DoH client #72
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With this, DoH client can automatically enable http2 if server (very likely) supports it. It hopefully reduces latency, which is very crucial for DNS.
Previously, sendQuery() sent multiple requests simultaneously, and I observed frequent error logs like:
Because http/1.x doesn't intrinsically support multiplexing, the multiple waiting goroutines are not guaranteed to get responses in the order of requests. So, this is actually a bug fix :)