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plugin/https: Add max_streams to limit HTTP/2 concurrent streams (#8522)

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Add a max_streams option to the *https* plugin to limit the number of
concurrent HTTP/2 streams per DoH connection. This lets operators cap
per-connection concurrency (guarding against resource exhaustion) or
raise it above the Go default for high-fan-in clients that multiplex
many requests over a single connection.

Semantics match the existing *https3* plugin's max_streams:
- omitted  -> Go HTTP/2 server default is used
- 0        -> use the underlying HTTP/2 transport default
- positive -> advertise exactly that many concurrent streams
- negative -> rejected at config parse time

The limit is applied via the standard library http.Server.HTTP2
(HTTP2Config.MaxConcurrentStreams) so it is advertised in the server's
SETTINGS frame.

Signed-off-by: Mekias Yohannes <mmyohannes@gmail.com>
This commit is contained in:
myohannes
2026-09-06 22:16:44 -04:00
committed by GitHub
parent 558c9757a9
commit 2b8c305203
9 changed files with 392 additions and 3 deletions
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4
core/dnsserver/config.go
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@@ -114,6 +114,10 @@ type Config struct {
// This is nil if not specified, allowing for a default to be used.
MaxHTTPSConnections *int
// MaxHTTPSStreams defines the maximum number of concurrent HTTP/2 streams per HTTPS connection.
// This is nil if not specified, allowing for a default to be used.
MaxHTTPSStreams *int
// MaxHTTPS3Streams defines the maximum number of concurrent QUIC streams for HTTPS3.
// This is nil if not specified, allowing for a default to be used.
MaxHTTPS3Streams *int