urlSession(_:task:didCompleteWithError:)

Declaration

optional func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: (any Error)?)

Parameters

• session:

  The session containing the task that has finished transferring data.

• task:

  The task that has finished transferring data.

• error:

  If an error occurred, an error object indicating how the transfer failed, otherwise NULL.

Mentioned in

• Pausing and resuming downloads
• Downloading files from websites
• Fetching website data into memory
• Pausing and resuming uploads

Discussion

The only errors your delegate receives through the error parameter are client-side errors, such as being unable to resolve the hostname or connect to the host. To check for server-side errors, inspect the response property of the task parameter received by this callback.