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req.get() retrieves a request header in Express.

res.sendStatus() sets the status code and sends its string representation.

app.use((err, req, res, next)) defines an error-handling middleware.

Node.js is a JavaScript runtime built on Chrome’s V8 engine.

The http module creates an HTTP server in Node.js.

res.json() sends a JSON response to the client.

res.download() sends a file as an attachment for download.

app.enable() enables a setting in the Express app.

res.end() ends the response process in Express.

express.static() serves static files like HTML, CSS, and images.

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