Affected URL(s)

https://nodejs.org/docs/latest-v16.x/api/http.html#messageheaders
https://nodejs.org/docs/latest-v18.x/api/http.html#messageheaders

Description of the problem

With req.getHeaders(), you get an error:

$ node <name>.js
<go to: http://localhost:<port>/>
[...]
TypeError: req.getHeaders is not a function

with req.headers, you don't.

However, the example in the docs (both v16 and v18) shows the (non-working) use of:
console.log(request.getHeaders());

..under the sub-section message.headers.