When using the object form of http.request and using an IPv6 address as a hostname, and using a non-standard port, the Host header is created incorrectly...

Example code:

http.request({ method: 'GET', hostname: '::1', port:'3000', path: '/api', }, (res) => { console.log(res.statusCode, res.body); }) .end()

This triggers a HTTP request with:

GET /api HTTP/1.1 Host: ::1:3000 

Compared to (for example) curl http://[::1]:3000/api, which does

GET /api HTTP/1.1 Host: [::1]:3000 

For reference: https://tools.ietf.org/html/rfc7230#section-5.4

• Kudos to @mpotra for helping me debug this issue..