リクエスト先URLにテンプレートを使用
課題
リクエストによってURLの一部のみが変更になるような、HTTPリクエストのURLを動的に設定したい。
課題
mustache URLテンプレートを使用して
URLを動的に設定するよう HTTP Request ノードを設定します。
例
[{"id":"41747a17.54ffd4","type":"http request","z":"c9a81b70.8abed8","name":"","method":"GET","ret":"txt","url":"https://jsonplaceholder.typicode.com/posts/{{post}}","tls":"","x":550,"y":480,"wires":[["d682318c.36823"]]},{"id":"d682318c.36823","type":"debug","z":"c9a81b70.8abed8","name":"","active":true,"console":"false","complete":"payload","x":710,"y":480,"wires":[]},{"id":"90bfea22.dd2b98","type":"inject","z":"c9a81b70.8abed8","name":"post id","topic":"","payload":"2","payloadType":"str","repeat":"","crontab":"","once":false,"x":250,"y":480,"wires":[["e67a0cc.596d4f"]]},{"id":"e67a0cc.596d4f","type":"change","z":"c9a81b70.8abed8","name":"","rules":[{"t":"set","p":"post","pt":"msg","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":390,"y":480,"wires":[["41747a17.54ffd4"]]}]
In this flow, the Inject node sends an id for a post we would like to request from an API. The Change node changes this to msg.post. The HTTP Request node generates a URL by substituting msg.post of the URL property configured as shown:
https://jsonplaceholder.typicode.com/posts/{{post}}
The JSON output from this API in the debug panel will look as follows:
{
"userId": 1,
"id": 2,
"title": "qui est esse",
"body": "est rerum tempore vitae\nsequi sint nihil reprehenderit dolor beatae ea dolores neque\nfugiat blanditiis voluptate porro vel nihil molestiae ut reiciendis\nqui aperiam non debitis possimus qui neque nisi nulla"
}
議論
デフォルトでは、mustacheは値の中のHTMLエンティティをエスケープします。
URLエスケープが効かないようにするには {{{triple}}} のように中括弧を使います。