How to get 401 error from servicestack swift client? - swift

Question

First our codes
let req = SignUp()
req.loginName = "abc#abc.com"
req.passWord = "xxx"
do{
let resp = try client.put(req) <---Where we had an error
} catch {
//some error handling
//.....
}
And then, when we input the correct information, everything is fine but when the login credential is wrong, we had expected to get an 401 error with a proper error message, we didn't. And when we traced it trying to find the origin of this, we had traced it back to JsonServicClient.swift (generated from ServiceStack swift plugin for Xcode 7.2), line 266.
public func send<T : JsonSerializable>(intoResponse:T, request:NSMutableURLRequest) throws -> T {
var response:NSURLResponse? = nil
var data = NSData()
do {
data = try NSURLConnection.sendSynchronousRequest(request, returningResponse: &response)
var error:NSError? = NSError(domain: NSURLErrorDomain, code: NSURLErrorUnknown, userInfo: nil)
if let dto = self.handleResponse(intoResponse, data: data, response: response!, error: &error) {
//^^^error here, response is null/can't be null
return dto
}
if let e = error {
throw e
}
return T()
} catch var ex as NSError? {
if let e = self.handleResponse(intoResponse, data: data, response: response!, error: &ex) {
return e
}
throw ex!
}
}
So here is the question, how to properly use ServiceStack swift plugin to get 401 error? When the service returns 400, everything is fine. This problem only happens when the servicestack server api returns 401. Which is by design, we supposed to return 401 when a user authentication fails.

Answer 1

This is a bug in Swift's sendSynchronousRequest which sometimes returns a null response which makes it impossible to determine what the server error response was. I've added a fix for this issue in this commit where it will now throw an unknown Error instead of segfaulting but as Swift doesn't return a HTTP Response we can't query it to return any more info about the error, e.g:
do {
try client.post(request)
} catch let responseError as NSError {
//Swift Bug: 401 returns an unitialized response so status is nil
if let status:ResponseStatus = responseError.convertUserInfo() {
}
}
To get the latest version you can either replace to latest JsonServiceClient.swift or delete the JsonServiceClient.swift and Add/Remove a new Service Reference which will download the latest version.
If you can, you can also switch to use the Async API's which doesn't have this issue:
client.postAsync(request)
.error { responseError in
let status:ResponseStatus = responseError.convertUserInfo()!
status.errorCode //= Unauthorized
}