{"product_id":"parallel-webhook-http-fan-out-with-timing-report-in-n8n","title":"Parallel Webhook HTTP Fan-Out with Timing Report in n8n","description":"\u003ch3\u003eSend multiple webhook HTTP requests in parallel—and get a timing report to prove it\u003c\/h3\u003e\n\u003cp\u003eThis n8n workflow performs a true \u003cstrong\u003eHTTP fan-out\u003c\/strong\u003e: it triggers three internal n8n webhook endpoints concurrently via \u003cstrong\u003eHTTP POST\u003c\/strong\u003e, simulates independent runtimes, and returns a \u003cstrong\u003eparallelism timing report\u003c\/strong\u003e (including overlap, ordering, and wall time vs. summed durations) to confirm the tasks ran at the same time.\u003c\/p\u003e\n\n\u003ch3\u003eWhat this workflow does\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilds three input items\u003c\/strong\u003e (one per service) containing a target webhook URL and payload.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCombines items into a single list\u003c\/strong\u003e and sends them as \u003cstrong\u003econcurrent HTTP POST requests\u003c\/strong\u003e using the \u003cstrong\u003eHTTP Request\u003c\/strong\u003e node with \u003cstrong\u003ebatching disabled\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003cli\u003eCalls three webhook endpoints—\u003cstrong\u003e\/webhook\/service-1\u003c\/strong\u003e, \u003cstrong\u003e\/webhook\/service-2\u003c\/strong\u003e, and \u003cstrong\u003e\/webhook\/service-3\u003c\/strong\u003e—each starting its own execution.\u003c\/li\u003e\n  \u003cli\u003eEach service handler \u003cstrong\u003erecords startedAt\u003c\/strong\u003e, then \u003cstrong\u003ewaits for a different duration\u003c\/strong\u003e to simulate separate service runtimes, and finally returns JSON with \u003cstrong\u003eservice name\u003c\/strong\u003e, \u003cstrong\u003estartedAt\u003c\/strong\u003e, \u003cstrong\u003eendAt\u003c\/strong\u003e, and \u003cstrong\u003eexecutionId\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAggregates responses\u003c\/strong\u003e and calculates key metrics: \u003cstrong\u003eoverlap\u003c\/strong\u003e, \u003cstrong\u003ewall time vs summed durations\u003c\/strong\u003e, plus \u003cstrong\u003earrival and finish order\u003c\/strong\u003e to verify parallel execution.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eUse cases\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eValidate whether your n8n design actually runs \u003cstrong\u003econcurrent webhook calls\u003c\/strong\u003e (not sequentially) before deploying production workflows.\u003c\/li\u003e\n  \u003cli\u003eBenchmark and compare “fan-out” performance for downstream internal services.\u003c\/li\u003e\n  \u003cli\u003eTriage timing issues by analyzing \u003cstrong\u003eexecutionId\u003c\/strong\u003e and per-service start\/end timestamps.\u003c\/li\u003e\n  \u003cli\u003eDemonstrate parallelism in automation engineering reviews with an evidence-based timing report.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical details\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNodes used:\u003c\/strong\u003e Set, Wait, Merge, Webhook, Sticky Note, HTTP Request.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConcurrency mechanism:\u003c\/strong\u003e HTTP Request with \u003cstrong\u003ebatching disabled\u003c\/strong\u003e to issue parallel POSTs to internal webhook endpoints.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSetup: \u003c\/strong\u003eUpdate \u003ccode\u003ehttps:\/\/YOUR-N8N-URL\u003c\/code\u003e in the service definitions, activate the workflow so the webhook endpoints are available, and optionally adjust wait durations and HTTP Request timeout.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"N8N Commerce","offers":[{"title":"Default Title","offer_id":45812009042099,"sku":"N8N-17968","price":64.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0749\/6279\/6723\/files\/9iZwcQDWwXRWIgmufB5T4_WLLonYRe.png?v=1786352868","url":"https:\/\/buyflowscripts.com\/products\/parallel-webhook-http-fan-out-with-timing-report-in-n8n","provider":"N8N Commerce","version":"1.0","type":"link"}