feat: expose HTTP2 header and protocol limits

transport/http2/server.go

@@ -35,6 +35,7 @@ type Server struct {
 	MaxConnections        int
 	MaxConcurrentRequests int
 	MaxConcurrentStreams  uint32
+	MaxHeaderBytes        int
 	MaxBodyBytes          int64
 	IdleTimeout           time.Duration
 	TLSHandshakeTimeout   time.Duration
@@ -55,6 +56,7 @@ type Server struct {
 	accepted       atomic.Uint64
 	rejectedConns  atomic.Uint64
 	rejectedReqs   atomic.Uint64
+	protocolErrors atomic.Uint64
 	activeConns    atomic.Int64
 	activeRequests atomic.Int64
 	wg             sync.WaitGroup
@@ -66,6 +68,7 @@ type Stats struct {
 	AcceptedConnections uint64 `json:"acceptedConnections"`
 	RejectedConnections uint64 `json:"rejectedConnections"`
 	RejectedRequests    uint64 `json:"rejectedRequests"`
+	ProtocolErrors      uint64 `json:"protocolErrors"`
 	ActiveConnections   int64  `json:"activeConnections"`
 	ActiveRequests      int64  `json:"activeRequests"`
 }
@@ -89,6 +92,7 @@ func (s *Server) Stats() Stats {
 		AcceptedConnections: s.accepted.Load(),
 		RejectedConnections: s.rejectedConns.Load(),
 		RejectedRequests:    s.rejectedReqs.Load(),
+		ProtocolErrors:      s.protocolErrors.Load(),
 		ActiveConnections:   s.activeConns.Load(),
 		ActiveRequests:      s.activeRequests.Load(),
 	}
@@ -226,8 +230,11 @@ func (s *Server) Serve(ctx context.Context, listener net.Listener) error {
 	protocolServer := &xhttp2.Server{
 		MaxConcurrentStreams: s.MaxConcurrentStreams,
 		IdleTimeout:          s.IdleTimeout,
+		CountError: func(string) {
+			s.protocolErrors.Add(1)
+		},
 	}
-	shutdownConfig := &http.Server{IdleTimeout: s.IdleTimeout}
+	shutdownConfig := &http.Server{IdleTimeout: s.IdleTimeout, MaxHeaderBytes: s.MaxHeaderBytes}
 	if err := xhttp2.ConfigureServer(shutdownConfig, protocolServer); err != nil {
 		cancel()
 		s.mu.Lock()