I am using URLSessionConfiguration.background and uploadTask to upload a file from an iOS app.
request.httpMethod = "POST"
request.setValue("application/octect-stream", forHTTPHeaderField: "Content-Type")
let task = uploadURLSession.uploadTask(with: request, fromFile: fileURL)
I'd like to understand how to manage the error handling.
How the http errors 4xx or 5xx are handled by the URLSession.uploadTask?
URLSession distinguishes between:
Transport errors, which are problems getting the request to the server or getting the response back from the server
Server errors, which originate on the server, like the 4xx or 5xx you mentioned
When a request completes the session calls your urlSession(_:task:didCompleteWithError:) delegate method. If there’s a transport error, it’s in the error parameter. If that’s nil, look in the response for a server error. Specifically, grab task.response, cast it to an HTTPURLResponse, and look at its stateCode field:
let response = task.response
let httpResponse = (response as! HTTPURLResponse)
let status = httpResponse.statusCode
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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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