Task: Extract post titles from a blog

n8n workflow JSON:
{"nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[250,300],"parameters":{},"typeVersion":1},{"name":"HTTP Request","type":"n8n-nodes-base.httpRequest","position":[450,300],"parameters":{"url":"https://hackernoon.com/","options":{},"responseFormat":"string"},"typeVersion":1},{"name":"HTML Extract","type":"n8n-nodes-base.htmlExtract","position":[650,300],"parameters":{"options":{},"extractionValues":{"values":[{"key":"item","cssSelector":"h2","returnArray":true,"returnValue":"html"}]}},"typeVersion":1},{"name":"HTML Extract1","type":"n8n-nodes-base.htmlExtract","position":[850,300],"parameters":{"options":{},"dataPropertyName":"item","extractionValues":{"values":[{"key":"title","cssSelector":"a"},{"key":"url","attribute":"href","cssSelector":"a","returnValue":"attribute"}]}},"typeVersion":1}],"connections":{"HTML Extract":{"main":[[{"node":"HTML Extract1","type":"main","index":0}]]},"HTTP Request":{"main":[[{"node":"HTML Extract","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"HTTP Request","type":"main","index":0}]]}}}