操作无法完成。 （Alamofire.AFError 错误 9。）

Question

On a network request handled by Alamofire, I often get this error:

The operation could not complete. (Alamofire.AFError error 9.)

Has anyone a clue about what this error 9 is?

I suppose AFError being an enum and conforming to protocol Error , this error 9 could be the raw value of the createURLRequestFailed(error:) case (which is the 10th case in this enum). AFError enumeration reference

I then implemented some delegate methods in EventMonitor , like

public func request(_ request: Request, didFailToCreateURLRequestWithError error: AFError)

public func request(_ request: Request, didCompleteTask task: URLSessionTask, with error: AFError?)

public func request(_ request: UploadRequest, didFailToCreateUploadableWithError error: AFError)

public func request(_ request: Request, didFailTask task: URLSessionTask, earlyWithError error: AFError)

but none of these seem to be triggered for this error (especially the first one, which seemed a good fit).

How can I debug this error and find the root cause of the issue?

Answer 1

I found this, where you can debug this by casting the AFError to an NSError or URLError and from there on debug what it is that actually went wrong.

https://github.com/Alamofire/Alamofire/issues/3068