http

The http module provides utilities to create HTTP servers and clients. It supports request/response streaming, headers, and status codes.

API Surface

Server

• http.createServer([options], requestListener) — create an HTTP server.
• server.listen(port[, host], callback) — start listening.
• request (IncomingMessage):
  • req.method, req.url, req.headers
  • req.on("data"), req.on("end")
• response (ServerResponse):
  • res.statusCode, res.setHeader(name, value)
  • res.write(data), res.end([data])

Client

• http.request(options, callback) — create HTTP request.
• http.get(options, callback) — shortcut for GET.
• ClientRequest: .write(), .end().
• IncomingMessage: stream for response body.

Examples (English only)

const http = require("http");

// Simple HTTP server
const server = http.createServer((req, res) => {
  console.log(req.method, req.url);
  res.statusCode = 200;
  res.setHeader("Content-Type", "text/plain");
  res.end("Hello World\n");
});

server.listen(3000, () => console.log("Server running on port 3000"));

// Simple HTTP client GET
http.get("http://localhost:3000", (res) => {
  console.log("status:", res.statusCode);
  res.on("data", (chunk) => console.log("body:", chunk.toString()));
});

Notes

• Responses must be explicitly ended with res.end().
• Always set proper headers (e.g., Content-Type) for clients.
• Request and response bodies are streams; handle 'data' and 'end'.
• For HTTPS, use the separate https module.