Get server response message from error
Solution 1
The data is not parsed in the .Failure case per the Alamofire 3.0 migration guide. However, server data is still available in response.data and can be parsed.
Below should work to parse this manually:
Alamofire.request(.POST, "https://example.com/create", parameters: ["foo": "bar"])
.validate()
.responseJSON { response in
switch response.result {
case .Success:
print("Validation Successful")
case .Failure(_):
var errorMessage = "General error message"
if let data = response.data {
let responseJSON = JSON(data: data)
if let message: String = responseJSON["message"].stringValue {
if !message.isEmpty {
errorMessage = message
}
}
}
print(errorMessage) //Contains General error message or specific.
}
}
}
This uses SwiftyJSON which provides the JSON struct to convert NSData. Parsing NSData to JSON can done without SwiftyJSON, answered here.
Another cleaner option might be to write a Custom Response Serializer.
Solution 2
A method with the router and no SwiftyJSON:
Alamofire.request(APIRouter.Register(params: params)).validate().responseJSON { response in
switch response.result {
case .Success(let json):
let message = json["clientMessage"] as? String
completion(.Success(message ?? "Success"))
case .Failure(let error):
var errorString: String?
if let data = response.data {
if let json = try? JSONSerialization.jsonObject(with: data, options: []) as? [String: String] {
errorString = json["error"]
}
}
completion(.Error(errorString ?? error.localizedDescription))
}
}
Solution 3
I have used the following lines to read the response body from a Alamofire request.
Alamofire.request(.POST, serveraddress, headers: headers, encoding: .JSON)
.response{ request, response, data, error in
let responseData = String(data: data!, encoding: NSUTF8StringEncoding)
print(responseData)
}
With this body I can get my custom server response errormessage.
best regards
Admin
Updated on July 21, 2022Comments
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Admin almost 2 years
My server (CakePHP) is responding like so:
$this->response->statusCode('400'); $this->response->type('json'); $this->response->body(json_encode(array('message' => 'Bookmark already exists')));
The Postman output looks like what you would expect:
{"message":"Bookmark already exists"}
The problem is that I cannot find a way to access this message from the failure handler (Alamofire 3.1.3 + SwiftyJSON 2.3.2)
Alamofire.request(.POST... .validate() .responseJSON { response in switch response.result { case .Success(_): // All good case .Failure(let error): // Status code 400 print(response.request) // original URL request print(response.response) // URL response print(response.data) // server data print(response.result)
I cannot find a way to cast response.data to JSON as a I simply get nil and the result returns just FAILURE.
Is there a way to access this server message from the failure handler ?
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Vishal Raj over 7 yearsThanks, really saved my day :)