Got this error with retrofit2 & OkHttp3. Unable to resolve host “”: No address associated with hostname

Question

I am using the retrofit 2 and OkHttp3 to request data from server. I just added a offline cache code but It\'s not working as expected. I got the error \"Unable to resolve host

Answer 1

I had the same error in my project with kotlin, and I fixed it like this:

client.addInterceptor(provideOfflineCacheInterceptor(context))
client.addNetworkInterceptor(provideCacheInterceptor(context))

private fun provideOfflineCacheInterceptor(context: Context): Interceptor {
        return Interceptor { chain ->
            var request = chain.request()
            var cacheHeaderValue = if (!hasNetwork(context)!!){
                    "public, only-if-cached, max-stale=" + 60 * 60 * 24 * 1
                } else {
                    "public, max-age=" + 5
                }
            request = request.newBuilder().header("Cache-Control", cacheHeaderValue).build()
            chain.proceed(request)
        }
    }

    private fun provideCacheInterceptor(context: Context): Interceptor {
        return Interceptor { chain ->
            val request = chain.request()
            var cacheHeaderValue = if (!hasNetwork(context)!!){
                    "public, only-if-cached, max-stale=" + 60 * 60 * 24 * 1
                } else {
                    "public, max-age=" + 5
                }
            //request = request.newBuilder().build()
            val response = chain.proceed(request)
            response.newBuilder()
                    .removeHeader("Pragma")
                    .removeHeader("Cache-Control")
                    .header("Cache-Control", cacheHeaderValue)
                    .build()
        }
    }