Alamofire returns .Success on error HTTP status codes

Question

I have a pretty simple scenario that I\'m struggling with. I\'m using Alamofire to register a user on a rest API. The first call to register is successful and the user can l

Answer 1

If using response, you can check the NSHTTPURLResponse parameter:

Alamofire.request(urlString, method: .post, parameters: registrationModel.getParentCandidateDictionary(), encoding: JSONEncoding.default)
    .response { response in
        if response.response?.statusCode == 409 {
            // handle as appropriate
        }
}

By default, 4xx status codes aren't treated as errors, but you can use validate to treat it as an such and then fold it into your broader error handling:

Alamofire.request(urlString, method: .post, parameters: registrationModel.getParentCandidateDictionary(), encoding: JSONEncoding.default)
    .validate()
    .response() { response in
        guard response.error == nil else {
            // handle error (including validate error) here, e.g.

            if response.response?.statusCode == 409 {
                // handle 409 here
            }
            return
        }
        // handle success here
}

Or, if using responseJSON:

Alamofire.request(urlString, method: .post, parameters: registrationModel.getParentCandidateDictionary(), encoding: JSONEncoding.default)
.validate()
.responseJSON() { response in
    switch response.result {
    case .failure:
        // handle errors (including `validate` errors) here

        if let statusCode = response.response?.statusCode {
            if statusCode == 409 {
                // handle 409 specific error here, if you want
            }
        }
    case .success(let value):
        // handle success here
        print(value)
    }
}

The above is Alamofire 4.x. See previous rendition of this answer for earlier versions of Alamofire.