How do i test if the response was already set/send?

express, node.js

Solution

`response.headersSent` should work.

For example:

if (response.headersSent) {
    console.log('Headers sent!')
} else {
    console.log('Headers have not been sent.')
}
res.writeHead(200);
if (response.headersSent) {
    console.log('Headers sent!')
} else {
    console.log('Headers have not been sent.')
}

Connecting with a client should log:

Headers have not been sent.
Headers sent!

Problem

I have the case that a express controller action "may" send contents. "Send" means either content was send (http 200) or the http status was set to something (http status 204 or a redirect for example) If nothing was sent/set a default routine should send a default content. how can i test in my default routine if the express controller action already set contents or set the status code ?

Original source

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