How to detect http vs https from an Http.IncomingMessage in node.js

Question

Given an Http.IncomingMessage created by an http(s).Server in response to a request what's the correct / recommended way to detect if the request is http vs https?

Some random ideas that I have no idea are correct

• Check the port

  // seems wrong - might be using a different port
  const isHTTPS = req.socket.address().port === 443;
  

• Check if the socket has a cert

  // does no cert mean it wasn't https?
  const isHTTPS = req.socket.getPeerCertificate &&
       request.socket.getPeerCertificate() !== null;
  

• Check if the socket has the function getPeerCertificate

  // does no func = !https?
  const isHTTPS = req.socket.getPeerCertificate !== undefined;
  

• Check if the socket is a tls.TLSSocket

  const tls = require('tls');
  
  const isHTTPS = req.socket instanceof tls.TLSSocket;
  

• other?

Answer 1

req.socket will have a property called encrypted set to true for HTTPS connections.