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Date: Mon, 16 Mar 2026 13:42:51 +0900
Subject: [PATCH] =?UTF-8?q?fix(backend):=20Accept=E3=83=98=E3=83=83?=
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* fix(backend): Acceptヘッダを署名の対象に含めないように

* Update Changelog
---
 CHANGELOG.md                                              | 1 +
 packages/backend/src/core/activitypub/ApRequestService.ts | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1e6a582700..bec4b9d8c9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 
 ### Server
 - Fix: 自分の行ったフォロワー限定投稿または指名投稿に自分自身でリアクションなどを行った場合のイベントが流れない問題を修正
+- Fix: 署名付きGETリクエストにおいてAcceptヘッダを署名の対象から除外（Acceptヘッダを正規化するCDNやリバースプロキシを使用している際に挙動がおかしくなる問題を修正）
 
 
 ## 2026.3.1
diff --git a/packages/backend/src/core/activitypub/ApRequestService.ts b/packages/backend/src/core/activitypub/ApRequestService.ts
index d14b82dc92..0ad885a17c 100644
--- a/packages/backend/src/core/activitypub/ApRequestService.ts
+++ b/packages/backend/src/core/activitypub/ApRequestService.ts
@@ -81,7 +81,7 @@ export class ApRequestCreator {
 			}, args.additionalHeaders),
 		};
 
-		const result = this.#signToRequest(request, args.key, ['(request-target)', 'date', 'host', 'accept']);
+		const result = this.#signToRequest(request, args.key, ['(request-target)', 'date', 'host']);
 
 		return {
 			request,