"double callback!" warning needs more details

I’m getting the infamous double callback! warning regularly in production and can’t figure out how to track it down. There’s no way to tell which requests are causing it (there’s many dozen varied ones running at any given time), or even which version of superagent it’s coming from (I’m running 2.3.0, but a dependency still uses 1.8.3). Including the request’s URL in the warning would help a lot and may allow me to spot a pattern that will lead to a repro; adding some indication that the warning is from superagent would be a nice touch too. Thanks.

[focusaurus]

If you can reproduce on demand, it would be great to get a stack trace. Edit the node_modules/superagent/lib/node.js file and replace this line:

 if (this.called) return console.warn('superagent: double callback bug');

with this line:

 if (this.called) throw new Error('superagent: double callback bug');

Then reproduce it and post the stack trace here.

[kornelski]

I’ve added more info in 1.8.5 and 3.2.0