Created
October 21, 2019 18:43
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Node.js - Example: HTTP
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| const http = require("http"); | |
| const fs = require("fs"); | |
| const welcomePage = `<html> | |
| <head><title>My First Page</title></head> | |
| <body><h1>Hello from my Node.js Server!</h1></body> | |
| </html>`; | |
| const defaultPage = `<html> | |
| <head><title>My First Page</title></head> | |
| <body> | |
| <h1>This Page is not available!</h1> | |
| <h2>Take me <a href="/index.html">home</a>.</h2> | |
| </body> | |
| </html>`; | |
| const todoPage = `<html> | |
| <head><title>My First Page</title></head> | |
| <body> | |
| <form action="/todo/add" method="POST"> | |
| <div><input type="text" name="todo" autofocus/></div> | |
| <div><button type="submit">Create</button></div> | |
| </form> | |
| </body> | |
| </html>`; | |
| /* Create a http server */ | |
| const server = http.createServer((request, response) => { | |
| const { url, method } = request; | |
| if (url === "/") { | |
| response.writeHead(301, { Location: "/index.html" }); | |
| return response.end(); | |
| } else { | |
| response.setHeader("Content-Type", "text/html"); | |
| if (url === "/index.html") { | |
| return response.end(welcomePage); | |
| } else if (url === "/todo.html") { | |
| return response.end(todoPage); | |
| } else if (url === "/todo/add" && method === "POST") { | |
| let data = ""; | |
| request.on("data", chunk => (data += chunk.toString())); | |
| request.on("end", () => { | |
| addTodo(data); | |
| response.writeHead(302, { Location: "/" }); | |
| return response.end(); | |
| }); | |
| return; | |
| } | |
| } | |
| response.statusCode = 404; | |
| response.end(defaultPage); | |
| }); | |
| /* Add a new todo note */ | |
| function addTodo(data) { | |
| const filename = "./todo.txt"; | |
| const note = processUserData(data); | |
| fs.exists(filename, exists => { | |
| if (exists) updateNotes(filename, note); | |
| else createNotes(filename, note); | |
| }); | |
| } | |
| function processUserData(data) { | |
| return decodeURIComponent(data) | |
| .replace(/(.*?)=(.*)/g, (m, key, value) => value) | |
| .replace(/\+/g, " "); | |
| } | |
| function updateNotes(filename, note) { | |
| fs.readFile(filename, "utf-8", (error, content) => { | |
| if (!error) createNotes(filename, [content, note].join("\n")); | |
| else console.error(`Could not read file ${filename}.`); | |
| }); | |
| } | |
| function createNotes(filename, note) { | |
| console.log(`Creating note ${filename}:`, "\n", note); | |
| fs.writeFile(filename, note, error => { | |
| if (error) { | |
| console.error(`Could not create file ${filename}.`); | |
| console.error(error); | |
| } | |
| }); | |
| } | |
| /* Bind server to a hostname and port */ | |
| const port = 8080; | |
| const host = "127.0.0.1"; | |
| server.listen(port, host, () => { | |
| console.log(`Server running at http://${host}:${port}/`); | |
| }); |
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