回答編集履歴
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追記
test
CHANGED
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@@ -49,3 +49,75 @@
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49
49
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add_header X-Frame-Options "ALLOW";
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```
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アプリケーションとのコンフリクトに注意
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-----
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アプリケーション側でX-Frame-Optionsを付け足す設定になっている場合があり、
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自分の場合は[Ruby on RailsがデフォルトでSAMEORIGINを返すようになっていた](https://programming.wikihub.io/@r7kamura/20160617011257)ため、
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Chromeではコンフリクトエラーが発生。
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>エラー
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```
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Refused to display 'https://hoge.com' in a frame because it set multiple 'X-Frame-Options' headers with conflicting values ('SAMEORIGIN, ALLOW'). Falling back to 'deny'
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```
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>ヘッダ
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```
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* Server nginx/1.10.1 is not blacklisted
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< Server: nginx/1.10.1
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< Date: Thu, 01 Feb 2018 23:59:11 GMT
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< Content-Type: text/html; charset=utf-8
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< Transfer-Encoding: chunked
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< Connection: keep-alive
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< X-Frame-Options: SAMEORIGIN
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< X-XSS-Protection: 1; mode=block
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< X-Content-Type-Options: nosniff
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< ETag: W/"460d2cbdc5ecf1d7417e99fc879fd127"
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< Cache-Control: max-age=0, private, must-revalidate
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< X-Request-Id: 5c24d399-9c62-4ffe-b4fa-47caed6409e9
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< X-Runtime: 0.013970
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< Access-Control-Allow-Origin: *
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< Access-Control-Allow-Methods: POST, GET, OPTIONS
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< Access-Control-Allow-Headers: *
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< Access-Control-Allow-Credentials: true
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< X-Frame-Options: ALLOW
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```
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今回のケースでは結局、nginxの設定を削除し、rails側の設定でALLOWとする。
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