happy-eyeballs: Specify AI_ADDRCONFIG for getaddrinfo
This might help to avoid returning IPv6 addresses on systems without IPv6 connectivity.
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@ -194,6 +194,7 @@ static int build_addr_list(const char *hostname, int port,
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_protocol = IPPROTO_TCP;
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hints.ai_flags = AI_ADDRCONFIG;
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if (context->bind_addr_len == sizeof(struct sockaddr_in))
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hints.ai_family = AF_INET;
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