8000 Hanging when using preconfigured NSURLSession in last version (3.1.3) · Issue #4888 · ktorio/ktor · GitHub
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Hanging when using preconfigured NSURLSession in last version (3.1.3) #4888

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timnazar opened this issue May 29, 2025 · 5 comments
Closed

Hanging when using preconfigured NSURLSession in last version (3.1.3) #4888

timnazar opened this issue May 29, 2025 · 5 comments

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@timnazar
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timnazar commented May 29, 2025 •
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Hey there

the requests are hanging when I'm passing my session and delegate

HttpClient(Darwin) {
    engine {
          usePreconfiguredSession(
               session = session,
               delegate = delegate
          )
          configureRequest {
              setAllowsCellularAccess(true)
          }
    }
}

It even doesn't call my KtorURLSessionDelegate

val bridgedDelegate: KtorNSURLSessionDelegate = KtorNSURLSessionDelegate { session, task, challenge, completionHandler ->
    Napier.d("challenge handler invoked", tag = "MEOWD")
}

        KodiKmpInitializer.initialize(
            data = data,
            componentRegistries = listOf(
                IosKtorComponentRegistry(
                    session = session,
                    delegate = bridgedDelegate
                ),
                RemoteConfigComponentRegistry(
                    appLanguageProvider = data.appLanguageProvider,
                    cacheDirPath = data.platformData.cacheDirPath,
                ),
            ),
        )

any tips for what can be the cause of the hanging? i also tried to pass NSURLSessionDelegate from my swift code (it crashes the app)
@timnazar
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timnazar commented May 29, 2025 •
edited
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Also tried this one. But response was never returned

val config = NSURLSessionConfiguration.defaultSessionConfiguration()
val newSession = NSURLSession.sessionWithConfiguration(config)
usePreconfiguredSession(
     session = newSession,
     delegate = delegate
)

and my delegate is

val bridgedDelegate: KtorNSURLSessionDelegate = KtorNSURLSessionDelegate { session, task, challenge, completionHandler ->
    Napier.d("challenge handler invoked", tag = "MEOWD")
    completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge.toLong(), null)
}

@osipxd
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osipxd commented May 29, 2025 •
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Are you able to reproduce this behavior if you wire the delegate with the session by passing it as a parameter to the NSURLSession.sessionWithConfiguration?

 val config = NSURLSessionConfiguration.defaultSessionConfiguration()
-val newSession = NSURLSession.sessionWithConfiguration(config)
+val newSession = NSURLSession.sessionWithConfiguration(config, delegate, delegateQueue = null)
 usePreconfiguredSession(
      session = newSession,
      delegate = delegate
 )

@timnazar
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timnazar commented May 29, 2025 •
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thanks for your reply, @osipxd

it calls my ktor delegate with suggested method. but now i'm wondering how to pass my swift session with swift delegate

is it possible?

actually, i'm handling my ssl pinning in swift`s delegate

urlSession(_ session: URLSession,
                           didReceive challenge: URLAuthenticationChallenge,
                           completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void)

so ktor should call this method in swift implementation and receive the completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void and continue handling the response from the api

@osipxd
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osipxd commented May 29, 2025

Does method DarwinClientEngineConfig.handleChallenge(block: ChallengeHandler) fits your needs?
Here is an example how this method can be used with Ktor's CertificatePinner:

HttpClient(Darwin) {
    engine {
        val pinningHandler = CertificatePinner.Builder()
            .add("example.com", "sha256/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=")
            .build()
        handleChallenge(pinningHandler)
    }
}

@timnazar
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much appreciate, Osip.
your first suggestion fits better in my case
i implemented KtorNSURLSessionDelegate with challenger and resolved everything i wanted
have a great day

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