What is the use of the validate() method in Alamofire.request? [closed]

Question

Alamofire.request(.GET, getUrl("mystuff")).validate() - what is the use of the validate() method? How can I use it to validate server connection issues?

Answer 1

As the documentation on GitHub mentions, validate() without parameters checks if the status code is 2xx and whether the optionally provided Accept part of the header matches the response's Content-Type.

Example:

Alamofire.request("https://example.com/get").validate().responseJSON { response in
    switch response.result {
    case .success:
        print("Validation Successful")
    case .failure(let error):
        print(error.localizedDescription)
    }
}

You can provide your custom validation options with statusCode and contentType parameters.

Example:

Alamofire.request("https://example.com/get")
    .validate(statusCode: 200..<300)
    .validate(contentType: ["application/json", "application/xml"])
    .responseData { response in
        [...]
}

If you want to check the status code manually, you can access it with response.response?.statusCode.

Example:

switch response.response?.statusCode {
case 200?: print("Success")
case 418?: print("I'm a teapot")
default: return
}