node, rpc: add ReadHeaderTimeout config option (#25338)

This change makes http.Server.ReadHeaderTimeout configurable separately
from ReadTimeout for RPC servers. The default is set to the same as
ReadTimeout, which in order to cause no change in existing deployments.

node/endpoints.go

@@ -39,10 +39,11 @@ func StartHTTPEndpoint(endpoint string, timeouts rpc.HTTPTimeouts, handler http.
 	CheckTimeouts(&timeouts)
 	// Bundle and start the HTTP server
 	httpSrv := &http.Server{
-		Handler:      handler,
-		ReadTimeout:  timeouts.ReadTimeout,
-		WriteTimeout: timeouts.WriteTimeout,
-		IdleTimeout:  timeouts.IdleTimeout,
+		Handler:           handler,
+		ReadTimeout:       timeouts.ReadTimeout,
+		ReadHeaderTimeout: timeouts.ReadHeaderTimeout,
+		WriteTimeout:      timeouts.WriteTimeout,
+		IdleTimeout:       timeouts.IdleTimeout,
 	}
 	go httpSrv.Serve(listener)
 	return httpSrv, listener.Addr(), err
@@ -75,6 +76,10 @@ func CheckTimeouts(timeouts *rpc.HTTPTimeouts) {
 		log.Warn("Sanitizing invalid HTTP read timeout", "provided", timeouts.ReadTimeout, "updated", rpc.DefaultHTTPTimeouts.ReadTimeout)
 		timeouts.ReadTimeout = rpc.DefaultHTTPTimeouts.ReadTimeout
 	}
+	if timeouts.ReadHeaderTimeout < time.Second {
+		log.Warn("Sanitizing invalid HTTP read header timeout", "provided", timeouts.ReadHeaderTimeout, "updated", rpc.DefaultHTTPTimeouts.ReadHeaderTimeout)
+		timeouts.ReadHeaderTimeout = rpc.DefaultHTTPTimeouts.ReadHeaderTimeout
+	}
 	if timeouts.WriteTimeout < time.Second {
 		log.Warn("Sanitizing invalid HTTP write timeout", "provided", timeouts.WriteTimeout, "updated", rpc.DefaultHTTPTimeouts.WriteTimeout)
 		timeouts.WriteTimeout = rpc.DefaultHTTPTimeouts.WriteTimeout

node/rpcstack.go

@@ -134,6 +134,7 @@ func (h *httpServer) start() error {
 	if h.timeouts != (rpc.HTTPTimeouts{}) {
 		CheckTimeouts(&h.timeouts)
 		h.server.ReadTimeout = h.timeouts.ReadTimeout
+		h.server.ReadHeaderTimeout = h.timeouts.ReadHeaderTimeout
 		h.server.WriteTimeout = h.timeouts.WriteTimeout
 		h.server.IdleTimeout = h.timeouts.IdleTimeout
 	}