This is the exception i get

java.lang.NoClassDefFoundError: Could not initialize class io.ktor.network.tls.CIOCipherSuites
    at io.ktor.client.engine.cio.HttpsConfig.<init>(CIOEngineConfig.kt:26)
    at io.ktor.client.engine.cio.CIOEngineConfig.<init>(CIOEngineConfig.kt:9)
    at io.ktor.client.engine.cio.CIO.create(CIO.kt:14)
    at io.ktor.client.engine.HttpClientEngineKt$config$1.create(HttpClientEngine.kt:47)
    at io.ktor.client.engine.HttpClientEngineFactory$DefaultImpls.create$default(HttpClientEngine.kt:36)
    at io.ktor.client.HttpClient.<init>(HttpClient.kt:32)
    at io.ktor.client.HttpClient.<init>(HttpClient.kt:31)

Any ideas on how I can fix this ?

Hi, @rahulrav. It look's like a bug. Could you report ktor, JDK and OS versions?

This only happens on AppEngine standard. Locally everything works.