Complete HTTP/2 protocol support for DNS-over-HTTPS (DoH) - Client and Server#2183

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Copilot wants to merge 13 commits intomasterfrom

copilot/add-http2-support-for-doh

Commits on Nov 9, 2025

Fix code review issues: overflow protection, buffer checks, C89 compatibility

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Add HTTP/2 connection context and stream management

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Move HTTP/2 protocol code to http2_parse.c and add handshake/poll functions

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Remove CodeQL symlink and add to .gitignore

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Implement complete HTTP/2 DoH server-side support

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Fix ALPN negotiation for HTTP/2 - set "h2" before TLS connection

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Fix ALPN negotiation - use "h2,http/1.1" for automatic protocol selection

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Revert ALPN to default empty for HTTPS - maintain compatibility

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Set default ALPN to "h2" for HTTPS - enable HTTP/2 by default

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