error.code missing on Network Error

Is your feature request related to a problem? Please describe. To properly identify errors reliably, I’d like to be able to either compare an error with instanceof or alternatively with error.code. However, this does not exist on most of the errors. I noticed that when defining a timeout, I get at least a 'ECONNABORTED' code. Other errors like 404, 403 are also missing this code.

Describe the solution you’d like I’d have for 400/500 codes the error code of the name of the error, or at least the classification ClientError or ServerError.

Describe alternatives you’ve considered I can also compare the name, but now I need to compile a list of codes,names and whatnot to check whether or not I am connected.

So right now I have error.code == 'ECONNABORTED' || error.name == 'Network Error' It would be a lot easier to consume and work with this error if I could e.g. create an array of matching error codes and just check with includes.

[jiangxiaoxin]

Maybe it’s just a feature

[jasonsaayman]

See #4209