Hi everyone I m facing a strange problem with my Ktor integr

Question

Hi everyone I m facing a strange problem with my Ktor integration on iOS I m using the bearer function of the Auth plugin The HttpClient on which I installed the plugin is a singleton When the first call requesting the Bearer token is fired the loadTokens function is called correctly and the tokens are loaded into the AuthTokenHolder instance managed by the plugin all the subsequent call using the token are properly created and executed At a certain point the user can logout from the app In that very moment I m deleting the tokens saved into the holder using the suggestion I ve found ```client plugin Auth providers filterIsInstance lt BearerAuthProvider gt first clearToken ``` I m clearing the tokens so that when the user login again the app doesn t reuse the tokens loaded in memory during the previous session If I understood it correclty clearing the AuthTokenHolder instance is needed for let the condition on to be false so that the code can continue and execute the line Then alle the subsequent call to loadToken should return on line unless the refreshTokensDeferred variable is set to null After clearing the holder I expect the loadTokens function to be called again so that the code can fetch the new tokens obtained after the new login of the user Unfortunately it doesn t happen and the first call using the Authorization header is using the access token used during the previous session Can you guys help me on that Thanks

Aleksei Tirman [JB] · Answer

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Aleksei Tirman [JB] · Answer

Unfortunately I cannot reproduce your problem with the above code

Aleksei Tirman [JB] · Answer

Can you share a code snippet or a sample project to reproduce it

Calogero · Answer

Yes I ll do it I ll prepare a project that replicates it and I ll share with you Unfortunately I can t share the real code

Calogero · Answer

I ve figured out what was causing the issue I don t have a clue about it The instance of HttpClient I was using on iOS was sligtly different than the one used on Android The iOS client had a plugin installed The plugin was created using the createPlugin function and it was changing the header in the onRequest fun under certain circumstances Removing the plugin fixed the problem Now every time I delete the tokens storage the app behaves as expected Are you aware of something like that

Calogero · Answer

Adding some other bit of context Due to some strange behaviour of our api gateway in case there s a 401 the WWW Authenticate header is not accepted by Ktor Ktor raises an exception saying the header is not well formed To fix the behaviour we also installed a custom plugin that created a WWW Authenticate header in a format accepted by Ktor This is the code ```install HeaderChanger interceptHttpResponse receivePipeline InternalAPI private fun interceptHttpResponse receivePipeline HttpReceivePipeline receivePipeline intercept HttpReceivePipeline Before response gt if response status value = Constants Network ErrorCodes UNAUTHORIZED proceedWith response return intercept val newResponse = object HttpResponse override val call HttpClientCall = response call override val content ByteReadChannel = response content override val coroutineContext = response coroutineContext override val headers Headers = HeadersBuilder apply remove HttpHeaders WWWAuthenticate append HttpHeaders WWWAuthenticate Bearer build override val requestTime GMTDate = response requestTime override val responseTime GMTDate = response responseTime override val status HttpStatusCode = response status override val version HttpProtocolVersion = response version this proceedWith newResponse ``` How harmful is that

Calogero · Answer

what do you think < Aleksei Tirman JB >

Aleksei Tirman [JB] · Answer

Unfortunately I cannot reproduce this problem with my code above and your interceptor Can you please adjust my code to make the problem reproducible on the simple case