From c8cd8a129ce06f3d4fcff59b03879ef296ecfe37 Mon Sep 17 00:00:00 2001
From: BZO95 <deffie.jnkiee@gmail.com>
Date: Tue, 24 Feb 2026 14:02:31 +0800
Subject: [PATCH] rpc: account for error responses in batch size limit

---
 rpc/handler.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/rpc/handler.go b/rpc/handler.go
index c0af162f13..cdf20df466 100644
--- a/rpc/handler.go
+++ b/rpc/handler.go
@@ -238,6 +238,11 @@ func (h *handler) handleBatch(msgs []*jsonrpcMessage) {
 			callBuffer.pushResponse(resp)
 			if resp != nil && h.batchResponseMaxSize != 0 {
 				responseBytes += len(resp.Result)
+				if resp.Error != nil {
+					if errData, err := json.Marshal(resp.Error); err == nil {
+						responseBytes += len(errData)
+					}
+				}
 				if responseBytes > h.batchResponseMaxSize {
 					err := &internalServerError{errcodeResponseTooLarge, errMsgResponseTooLarge}
 					callBuffer.respondWithError(cp.ctx, h.conn, err)