res.send res.write

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Mon Aug 22 2022 14:55:37 GMT+0000 (Coordinated Universal Time)

Saved by @chelobotix #res.sendres.write 

res.send

res.send is only in Express.js.
Performs many useful tasks for simple non-streaming responses.
Ability to automatically assigns the Content-Length HTTP response header field.
Ability to provides automatic HEAD & HTTP cache freshness support.
Practical explanation
res.send can only be called once, since it is equivalent to res.write + res.end()
Example:
app.get('/user/:id', function (req, res) {
    res.send('OK');
});
For more details:

Express.js: Response
res.write

Can be called multiple times to provide successive parts of the body.
Example:
response.write('<html>');
response.write('<body>');
response.write('<h1>Hello, World!</h1>');
response.write('</body>');
response.write('</html>');
response.end();
content_copyCOPY