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node.js - Why can't we do multiple response.send in Express.js?

3 years ago I could do multiple res.send in express.js.
even write a setTimeout to show up a live output.

response.send('<script class="jsbin" src="http://code.jquery.com/jquery-1.7.1.min.js"></script>');
response.send('<html><body><input id="text_box" /><button>submit</button></body></html>');
var initJs = function() {
  $('.button').click(function() {
    $.post('/input', { input: $('#text_box').val() }, function() { alert('has send');});
  });
}
response.send('<script>' + initJs + '</script>');

Now it will throw:

Error: Can't set headers after they are sent

I know nodejs and express have updated. why can't do that now? any other idea?


Found the solution but "res.write" is not in api reference http://expressjs.com/4x/api.html ...

: S

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1 Reply

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by (71.8m points)

Maybe you need: response.write

response.write("foo");
response.write("bar");
//...
response.end()

res.send implicitly calls res.write followed by res.end. If you call res.send multiple times, it will work the first time. However, since the first res.send call ends the response, you cannot add anything to the response.


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