Why should I learn the http module before Express?
Because Express builds on the http module. Understanding how requests, responses, and routing work at the raw level makes Express more meaningful and helps you debug at a deeper level, instead of seeing Express as magic.
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More FAQs in The Node.js http Module Explained: Requests, Responses, and Servers
http.createServer for creating servers, http.request for making requests, and the IncomingMessage (request) and ServerResponse (response) objects. It is the foundation that Express and other frameworks build on.
The request body is a readable stream. Listen to 'data' events for chunks and 'end' for completion. For JSON, concatenate chunks and JSON.parse the result. This is how Express body parsing works under the hood.
Because without end, the response is never finished and the request hangs. The client waits indefinitely. Always call response.end after sending the body, even if the body is empty.
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