Server-Sent Eventsテスト

app.js

var express = require('express');
var app = express();

app.get('/', function(req, res) {
  res.type('text/html');
  res.send('<script>' +
             'new EventSource(\'/event/a\').addEventListener(\'message\',function(event) {' +
               'document.body.appendChild(document.createElement(\'div\')).textContent = event.data;' +
             '});' +
           '</script>');
});

app.get('/event/:id', function(req, res) {
  res.type('text/event-stream');
  setInterval(function() {
    // 任意の文字列を返している、という想定
    res.write('data: <script>alert(1)</script>\n\n');
  }, 1000);
});

app.listen(3000);

package.json

{
    "name": "sse-test",
    "scripts": {
        "run": "node app.js"
    },
    "dependencies": {
        "express": "*"
    }
}