Added connection pooling to DoH2, DoH3 and DoQ - v1.10.0

Author: KianiDev

config/phantomd.conf

@@ -250,9 +250,10 @@ optimistic_stale_max_age = 86400
 # response is likely ready. Default: 30.
 optimistic_stale_response_ttl = 30
 
-# Connection pooling for upstream TCP/TLS connections — when enabled,
-# phantomd reuses established connections instead of creating a new one
-# for every query. This reduces handshake overhead and improves performance.
+# Connection pooling for upstream connections — phantomd reuses existing
+# connections instead of creating a new one for every query. This reduces
+# handshake overhead and improves performance for TCP, TLS, HTTP/2, HTTP/3,
+# and QUIC (DoQ) upstreams.
 # Maximum number of idle connections to keep per upstream (host/port).
 # Default: 5
 pool_max_size = 5
@@ -261,6 +262,19 @@ pool_max_size = 5
 # Default: 60.0
 pool_idle_timeout = 60.0
 
+# DoH version to use when talking to upstream servers over HTTPS.
+# Supported values:
+#   auto  — probe HTTP/3, then HTTP/2, then HTTP/1.1 to find the best
+#  1.1   — use HTTP/1.1 (always works, but slower)
+#  2     — use HTTP/2 (requires httpx with H2 support)
+#  3     — use HTTP/3 / QUIC (requires aioquic, experimental)
+# Default: auto
+doh_version = auto
+
+# When doh_version is set to auto, phantomd probes the upstream once
+# and caches the detected version for this many seconds. Default: 3600 (1h).
+doh_auto_cache_ttl = 3600
+
 ######################################################################
 # End of configuration file
 ######################################################################