learned http 🌐

http/chunked_response.js

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+const http = require('http');
+
+const PORT = 8000;
+const HOST_NAME = '127.0.0.1';
+
+const INTERVAL = 1000; // in ms
+
+const server = http.createServer((req, res) => {
+
+    let left = 10;
+
+    const intervalId = setInterval(() => {
+
+        for (let i = 0; i < 100; i++) {
+            res.write(`${Date.now()} `);
+        }
+        left -= 1;
+        res.write('\n');
+        if (left === 0) {
+            clearInterval(intervalId);
+            res.end('All done');
+        }
+
+    }, INTERVAL);
+
+});
+
+server.listen(PORT, HOST_NAME, () => {
+    console.log(`Listening at ${HOST_NAME}:${PORT}`);
+});

http/hello_world.js

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+const http = require('http');
+
+const PORT = 8000;
+const HOST_NAME = '127.0.0.1';
+
+const server = http.createServer((req, res) => {
+
+    req.on('data', (data) => {
+        console.log('Request body', data);
+    });
+
+    res.statusCode = 200;
+    res.setHeader('Content-Type', 'text/plain');
+
+    // shorthand for above two statements
+    // res.writeHead(200, {
+    //  'Content-Type': 'text/plain'
+    // });
+
+
+    res.write('Hello World!!\n');
+    // Can also be writtn as
+    // res.end('Hello World!!');
+
+    // We can extract some useful information from request object.
+    res.write(`Request url: ${req.url}\n`);
+    res.write(`Request Method: ${req.method}\n`);
+    res.write('Request Headers:\n');
+    res.write(JSON.stringify(req.headers, null, 4));
+    res.end();
+
+    res.on('error', (error) => {
+        console.log('Something went wrong', error);
+    });
+});
+
+server.listen(PORT, HOST_NAME, () => {
+    console.log(`Listening at ${HOST_NAME}:${PORT}`);
+});

http/static_file.js

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+const http = require('http');
+const path = require('path');
+const fs = require('fs');
+
+const PORT = 8000;
+const HOST_NAME = '127.0.0.1';
+
+const server = http.createServer((request, response) => {
+
+    const file = path.normalize(`.${request.url}`);
+    console.log('Trying to serve ', file);
+
+    const reportError = (error) => {
+        console.log(error);
+        response.writeHEAD(500);
+        return response.end('Internal server error.');
+    };
+
+    fs.exists(file, (exists) => {
+
+        if (!exists) {
+            response.writeHead(404);
+            return response.end('Not found.');
+        }
+
+        fs.stat(file, (error, stat) => {
+
+            if (error) {
+                return reportError(error);
+            }
+
+            if (stat.isDirectory()) {
+                response.writeHead(403);
+                return response.end('Forbidden');
+            }
+
+            const rs = fs.createReadStream(file);
+            rs.on('error', reportError);
+            response.writeHead(200);
+            rs.pipe(response);
+        });
+
+    });
+
+});
+
+server.listen(PORT, HOST_NAME, () => {
+    console.log(`Listening at ${HOST_NAME}:${PORT}`);
+});