Swift Alamofire How to get the HTTP response status code

Question

I would like to retrieve the HTTP response status code  e g  400  401  403  503  etc  for request failures  and ideally for successes too   In this code  I am performing user authentication with HTTP Basic and want to be able to message the user that authentication failed when the user mistypes their password     Alamofire request  GET   https   host com a path   authenticate user   user   password   typo         responseString    req  res  data  error  in          if error    nil                println  STRING Error   error   error                 println    req   req                 println    res   res                 println    data   data                 return                     println  SUCCESS for String            responseJSON    req  res  data  error  in          if error    nil                println  JSON Error   error   error                 println    req   req                 println    res   res                 println    data   data                 return                     println  SUCCESS for JSON           Unfortunately  the error produced does not seem to indicate that an HTTP status code 409 was actually received     STRING Error   error Optional Error Domain NSURLErrorDomain Code -999  cancelled  UserInfo 0x7f9beb8efce0  NSErrorFailingURLKey https   host com a path  NSLocalizedDescription cancelled  NSErrorFailingURLStringKey https   host com a path      req  lt NSMutableURLRequest  0x7f9beb89d5e0 gt    URL  https   host com a path      res nil    data Optional      JSON Error   error Optional Error Domain NSURLErrorDomain Code -999  cancelled  UserInfo 0x7f9beb8efce0  NSErrorFailingURLKey https   host com a path  NSLocalizedDescription cancelled  NSErrorFailingURLStringKey https   host com a path      req  lt NSMutableURLRequest  0x7f9beb89d5e0 gt    URL  https   host com a path      res nil    data nil      Additionally  it would be nice to retrieve the HTTP body when an error occurs because my server-side will put a textual description of the error there     Questions  Is it possible to retrieve the status code upon a non-2xx response   Is it possible to retrieve the specific status code upon a 2xx response   Is it possible to retrieve the HTTP body upon a non-2xx response     Thanks

User · Answer

I needed to know how to get the actual error code number.

I inherited a project from someone else and I had to get the error codes from a .catch clause that they had previously setup for Alamofire:

} .catch { (error) in

    guard let error = error as? AFError else { return }
    guard let statusCode = error.responseCode else { return }

    print("Alamofire statusCode num is: ", statusCode)
}

Or if you need to get it from the response value follow @mbryzinski's answer

Alamofire ... { (response) in

    guard let error = response.result.error as? AFError else { return }
    guard let statusCode = error.responseCode else { return }

    print("Alamofire statusCode num is: ", statusCode)
})

User · Answer

In the completion handler with argument response below I find the http status code is in response response statusCode   Alamofire request  POST  urlString  parameters  parameters               responseJSON completionHandler   response in                 switch response result                    case  Success let JSON                          Yeah  Hand response                 case  Failure let error                      let message   String                    if let httpStatusCode   response response  statusCode                         switch httpStatusCode                          case 400                            message    Username or password not provided                         case 401                            message    Incorrect password for user    name                                                                             else                         message   error localizedDescription                                            display alert with error message

User · Answer

Your error indicates that the operation is being cancelled for some reason  I d need more details to understand why  But I think the bigger issue may be that since your endpoint https   host com a path is bogus  there is no real server response to report  and hence you re seeing nil    If you hit up a valid endpoint that serves up a proper response  you should see a non-nil value for res  using the techniques Sam mentions  in the form of a NSURLHTTPResponse object with properties like statusCode  etc   Also  just to be clear  error is of type NSError  It tells you why the network request failed  The status code of the failure on the server side is actually a part of the response    Hope that helps answer your main question

User · Answer

Alamofire          request  GET   REQUEST URL   parameters  parms  headers  headers           validate statusCode  200   lt 300           responseJSON  response in              switch response result              case  Success                  if let JSON   response result value                                                 case  Failure let error

User · Answer

For Swift 3 x   Swift 4 0   Swift 5 0 users with Alamofire  gt   5 0 Used request modifier to increase and decrease the timeout interval  Alamofire s request creation methods offer the most common parameters for customization but sometimes those just aren t enough  The URLRequests created from the passed values can be modified by using a RequestModifier closure when creating requests  For example  to set the URLRequest s timeoutInterval to 120 seconds  modify the request in the closure  var manager   Session default  manager request urlString  method  method  parameters  dict  headers  headers  requestModifier     0 timeoutInterval   120    validate   responseJSON   response in  OR RequestModifiers also work with trailing closure syntax  var manager   Session default      manager request  quot https   httpbin org get quot     urlRequest in     urlRequest timeoutInterval   60     urlRequest allowsConstrainedNetworkAccess   false    response

User · Answer

For Swift 2 0 users with Alamofire   2 0  Alamofire request  GET  url     responseString      response  result in     if response  statusCode    200          Do something with result

User · Answer

In your responseJSON completion  you can get the status code from the response object  which has a type of NSHTTPURLResponse    if let response   res       var statusCode   response statusCode     This will work regardless of whether the status code is in the error range  For more information  take a look at the NSHTTPURLResponse documentation   For your other question  you can use the responseString function to get the raw response body  You can add this in addition to responseJSON and both will be called    responseJson    req  res  json  error  in       existing code    responseString          body     in       body is a String  containing the response body

User · Answer

Best way to get the status code using alamofire     Alamofire request URL  responseJSON     response in    let status   response response  statusCode   print  STATUS   status

User · Answer

For Swift 3 x   Swift 4 0   Swift 5 0 users with Alamofire    4 0   Alamofire    5 0     response response  statusCode     More verbose example   Alamofire request urlString           responseString   response in             print  Success    response result isSuccess                print  Response String    response result value                 var statusCode   response response  statusCode             if let error   response result error as  AFError                     statusCode   error  code    statusCode private                                  switch error                   case  invalidURL let url                       print  Invalid URL    url  -   error localizedDescription                    case  parameterEncodingFailed let reason                       print  Parameter encoding failed    error localizedDescription                        print  Failure Reason    reason                    case  multipartEncodingFailed let reason                       print  Multipart encoding failed    error localizedDescription                        print  Failure Reason    reason                    case  responseValidationFailed let reason                       print  Response validation failed    error localizedDescription                        print  Failure Reason    reason                         switch reason                       case  dataFileNil   dataFileReadFailed                          print  Downloaded file could not be read                       case  missingContentType let acceptableContentTypes                           print  Content Type Missing    acceptableContentTypes                        case  unacceptableContentType let acceptableContentTypes  let responseContentType                           print  Response content type    responseContentType  was unacceptable    acceptableContentTypes                        case  unacceptableStatusCode let code                           print  Response status code was unacceptable    code                            statusCode   code                                       case  responseSerializationFailed let reason                       print  Response serialization failed    error localizedDescription                        print  Failure Reason    reason                           statusCode   3840      maybe                   default break                                    print  Underlying error    error underlyingError                  else if let error   response result error as  URLError                   print  URLError occurred    error                  else                   print  Unknown error    response result error                               print statusCode     the status code           Alamofire 4 contains a completely new error system  look here for details   For Swift 2 x users with Alamofire    3 0  Alamofire request  GET  urlString         responseString   response in              print  Success    response result isSuccess                 print  Response String    response result value                 if let alamoError   response result error                  let alamoCode   alamoError code                let statusCode    response response  statusCode                  else     no errors                let statusCode    response response  statusCode     example   200

User · Answer

Or use pattern matching   if let error   response result error as  AFError      if case  responseValidationFailed  unacceptableStatusCode let code     error          print code

User · Answer

you may check the following code for status code handler by alamofire      let request   URLRequest url  URL string  url string             Alamofire request request  validate statusCode  200   lt 300  responseJSON    response  in         switch response result           case  success let data as  String Any                completion true data          case  failure let err               print err localizedDescription              completion false err          default              completion false nil                    if status  code is not validate it will be enter the failure in switch case

[swift] Swift Alamofire: How to get the HTTP response status code

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