I have a long running process which needs to send data back at multiple stages. Is there some way to send back multiple responses with express.js
res.send(200, 'hello')
res.send(200, 'world')
res.end()
but when I run curl -X POST localhost:3001/helloworld all I get is hello
How can I send multiple responses or is this not possible to do with express?
Use res.write().
res.send() already makes a call to res.end(), meaning you can't write to res anymore after a call to res.send (meaning also your res.end() call was useless).
EDIT: It is a Node.js internal function. See the documentation here
res.write() is a Node.js function, see the documentation here
res.write() isn't deprecated. I suggest removing your comment lest it mislead someone.You can only send one HTTP response for one HTTP request. However, you can certainly write whatever kind of data in the response that you want. That could be newline-delimited JSON, multipart parts, or whatever other format you choose.
If you want to stream events from the server to the browser, an easy alternative might be to use something like Server-sent events (polyfill).
write() repeatedly before calling send().Try this, this should solve your problem.
app.get('/', function (req, res) {
var i = 1,
max = 5;
//set the appropriate HTTP header
res.setHeader('Content-Type', 'text/html');
//send multiple responses to the client
for (; i <= max; i++) {
res.write('<h1>This is the response #: ' + i + '</h1>');
}
//end the response process
res.end();
});
res.write(JSON.stringify({
min,
max,
formattedData
}));
or
res.send({
min,
max,
formattedData
});
