Ktor Client HTTP Cache

Ktor Version

Ktor 1.1.3

Ktor Engine Used(client or server and name)

Ktor Client iOS engine

JVM Version, Operating System and Relevant Context

Feedback

I’m building a multi-platform (Android and iOS) kotlin project, using ktor client, and i want to have HTTP cache implemented. For android i’m using the OKHTTP client, and configuring the Cache using the HttpConfig.

In iOS i was expecting to have the default caching policy, but in the code, https://github.com/ktorio/ktor/blob/0b3548afa30ff11d13c7496c0047465a6825682f/ktor-client/ktor-client-ios/darwin/src/io/ktor/client/engine/ios/IosClientEngine.kt#L86 it is being set to NSURLRequestReloadIgnoringCacheData

Since the config parameter in the constructor is currently not used for anything, is there other way i can change http cache policy for iOS?

Why is the cache being disabled on the iOS Client? Can it lead to problems?

Thanks in advance

[Stexxe]

With the HttpCache feature installed it works as expected on iOS:

GlobalScope.launch(Dispatchers.Main) {
    val client = HttpClient(Ios) {
        install(HttpCache)
    }

    client.get<HttpResponse>("https://httpbin.org/cache")
    client.get<HttpResponse>("https://httpbin.org/cache")
}

The sample project is attached ios_cache.zip

If you have a case where caching doesn’t work as expected please describe it in the relevant YouTrack issue.

[e5l]

Hi @jrocharodrigues, thanks for the report.

We try to unify the client behavior with each engine. So we set HttpCache disabled by default. Probably we should expose request configuration in engine config.