How can I send back response headers with Node.js / Express?

For adding response headers before send, you can use the setHeader method:

response.setHeader('Content-Type', 'application/json')

The status only by the status method:

response.status(status_code)

Both at the same time with the writeHead method:

response.writeHead(200, {'Content-Type': 'application/json'});

res.writeHead(200, {'Content-Type': 'text/event-stream'});

http://nodejs.org/docs/v0.4.12/api/http.html#response.writeHead

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