diff --git a/files/ja/_redirects.txt b/files/ja/_redirects.txt
index b6326f3baaec11..4ebe58e53fdeb6 100644
--- a/files/ja/_redirects.txt
+++ b/files/ja/_redirects.txt
@@ -1349,6 +1349,8 @@
 /ja/docs/Glossary/Scrollport	/ja/docs/Glossary/Scroll_container
 /ja/docs/Glossary/Signature/セキュリティ	/ja/docs/Glossary/Signature/Security
 /ja/docs/Glossary/Signature/関数	/ja/docs/Glossary/Signature/Function
+/ja/docs/Glossary/Simple_header	/ja/docs/Glossary/CORS-safelisted_request_header
+/ja/docs/Glossary/Simple_response_header	/ja/docs/Glossary/CORS-safelisted_response_header
 /ja/docs/Glossary/Symbol	/ja/docs/Web/JavaScript/Reference/Global_Objects/Symbol
 /ja/docs/Glossary/Transferable_objects	/ja/docs/Web/API/Web_Workers_API/Transferable_objects
 /ja/docs/Glossary/XHR_(XMLHttpRequest)	/ja/docs/Glossary/XMLHttpRequest
diff --git a/files/ja/_wikihistory.json b/files/ja/_wikihistory.json
index 1da8896a2a654a..d8946fe31a7c32 100644
--- a/files/ja/_wikihistory.json
+++ b/files/ja/_wikihistory.json
@@ -1757,14 +1757,6 @@
     "modified": "2020-03-30T14:20:00.023Z",
     "contributors": ["Uemmra3", "Marsf", "MaxfieldWalker"]
   },
-  "Glossary/Simple_header": {
-    "modified": "2020-08-11T15:13:18.407Z",
-    "contributors": ["mfuji09"]
-  },
-  "Glossary/Simple_response_header": {
-    "modified": "2019-08-11T03:51:18.097Z",
-    "contributors": ["mfuji09", "silverskyvicto"]
-  },
   "Glossary/Site": {
     "modified": "2020-04-12T14:25:01.758Z",
     "contributors": ["mfuji09"]
diff --git a/files/ja/glossary/simple_header/index.md b/files/ja/glossary/simple_header/index.md
deleted file mode 100644
index 86cba75b163d35..00000000000000
--- a/files/ja/glossary/simple_header/index.md
+++ /dev/null
@@ -1,8 +0,0 @@
----
-title: Simple header (単純ヘッダー)
-slug: Glossary/Simple_header
----
-
-{{GlossarySidebar}}
-
-{{Glossary("CORS-safelisted request header", "CORS セーフリストリクエストヘッダー")}} の古い用語です。
diff --git a/files/ja/glossary/simple_response_header/index.md b/files/ja/glossary/simple_response_header/index.md
deleted file mode 100644
index 5526e168a0a731..00000000000000
--- a/files/ja/glossary/simple_response_header/index.md
+++ /dev/null
@@ -1,8 +0,0 @@
----
-title: Simple response header
-slug: Glossary/Simple_response_header
----
-
-{{GlossarySidebar}}
-
-{{Glossary("CORS-safelisted response header", "CORS セーフリストレスポンスヘッダー")}}の古い用語です。