Task: Respond with file download to incoming HTTP request

n8n workflow JSON:
{"nodes":[{"id":"0357b17f-9fcf-4725-8311-28bd9c76c37c","name":"On GET request","type":"n8n-nodes-base.webhook","position":[820,400],"webhookId":"454eb4ea-e460-4196-b31c-284abf234fc3","parameters":{"path":"download-pdf","options":{},"responseMode":"responseNode"},"typeVersion":1},{"id":"21d8c543-33c2-45eb-b392-2cb7139344c6","name":"Fetch binary file","type":"n8n-nodes-base.httpRequest","position":[1040,400],"parameters":{"url":"https://www.deutschebahn.com/resource/blob/8813300/bdf106f07186f66e4448f95aca02bd4a/Faktenblatt-ICE-L_Mai23-data.pdf","options":{"response":{"response":{"responseFormat":"file"}}}},"typeVersion":4.1},{"id":"3ced3067-d82c-4bb4-b5fe-53a8d79c2177","name":"Respond with attachment","type":"n8n-nodes-base.respondToWebhook","position":[1260,400],"parameters":{"options":{"responseHeaders":{"entries":[{"name":"content-disposition","value":"=attachment; filename=\"my_document_{{ $now.toFormat('yyyy-MM-dd') }}.pdf\""}]}},"respondWith":"binary"},"typeVersion":1}],"connections":{"On GET request":{"main":[[{"node":"Fetch binary file","type":"main","index":0}]]},"Fetch binary file":{"main":[[{"node":"Respond with attachment","type":"main","index":0}]]}}}