Make res.error / res.err an Error object

[rauchg]

Populated with useful debugging information:

• type ('socket' or 'http')
• text (body)
• url
• status
• headers

Example use case in Express:

request.get('/', function(res){
  // no wrapping needed that usually drops context
  if (res.err) return next(res.err);
});

Goals:

• ✓ Encompasses both socket and protocol (eg: 500 status) errors elegantly, but still flexible.
• ✓ Easy next ing, console.log ing, or passing around to handlers that already interpret Error objects
• ✓ Works with arity checks: err, res signatures would get res.err, res

[rauchg]

+1

[tj]

+1 I forgot they're all bools anyway so it might as well be something useful

[tj]

we could add err.request = this though potentially leaking memory pretty bad