How do I send HTML in chunks using Node.js and Express?
Question
I want to send the <head> containing stylesheets before processing the rest of the page. In PHP, I could use ob_flush() .
I tried doing something like this:
app.set('view engine','ejs');
app.get('*',function(req,res){
res.writeHead(200,{'Content-Type':'text/html'});
res.write('<!doctype...<link rel=stylesheet...');
doDBStuff()
.then(function(data){
res.render('index',{...}); // uses EJS for templating
});
});
However, the res.render() part does not get sent. Is there a built-in way to send chunked data?
One way to do it would be to manually load the EJS files and manually process them. I would also have to manually send the appropriate headers. I prefer a build-in method if it exists.
1 answers
solution1
4 2015-07-23 06:37:56
Here's a simple PoC that does what you want:
var express = require('express');
var app = express();
var server = app.listen(3000);
app.set('views', 'views');
app.set('view engine', 'ejs');
app.get('/', function (req, res, next) {
res.write('<!-- prefix -->');
setTimeout(function() {
res.render('index', { ... }, function(err, html) {
// TODO: handle errors
res.end(html);
});
}, 1000);
});
Note that it uses the "callback variant" of res.render() , which can be used to just render a template without sending back a response (if you don't do it this way, res.render() will generate an error). Alternatively, you can use app.render() which does the same.
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