Simple middleware to log information related to the underlying socket and proxies that forwarded the incoming request

socket-express-logger.js

// Set a DEBUG environment var to "*" or "socket-logger" to enable
const log = require('debug')('socket-logger')

// Place this before other middlewares so it is invoked first - remember they invoke in the defined order
app.use(function (req, res, next) {
  log('============================================================')
  log(`received request from remote socket with req.headers - ${JSON.stringify(req.headers)}`)
  log(`received request from remote socket with req.socket.address - ${JSON.stringify(req.socket.address())}`)
  log(`received request from remote socket with req.socket.localAddress - ${req.socket.localAddress}`)
  log(`received request from remote socket with req.socket.localPort - ${req.socket.localPort}`)
  log(`received request from remote socket with req.socket.remoteFamily - ${req.socket.remoteFamily}`)
  log(`received request from remote socket with req.socket.remotePort - ${req.socket.remotePort}`)
  log(`received request from remote socket with req.socket.remoteAddress - ${req.socket.remoteAddress}`)
  log('============================================================')
  
  // carry on with request processing...
  next()
})