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Hi!  I'm using ktor on Android to server a simple webpage.  It works... except in release mode (with proguard enabled) only part of the file is served, and then I see an exception in the logs.  After googling a bit, I've tried to add some proguard rules, but it didn't change anything.  Also the stacktrace is very cryptic (see thread below).

The stacktrace:
```
E/ktor.application: 200 OK: GET - /
    java.lang.NullPointerException: throw with null exception
        at io.ktor.routing.Routing$executeResult$1.invokeSuspend(Routing.kt)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:32)
        at io.ktor.util.pipeline.SuspendFunctionGun.resumeRootWith(PipelineContext.kt:183)
        at io.ktor.util.pipeline.SuspendFunctionGun.access$resumeRootWith(PipelineContext.kt:63)
        at io.ktor.util.pipeline.SuspendFunctionGun$continuation$1.resumeWith(PipelineContext.kt:88)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:45)
        at io.ktor.util.pipeline.SuspendFunctionGun.resumeRootWith(PipelineContext.kt:183)
        at io.ktor.util.pipeline.SuspendFunctionGun.access$resumeRootWith(PipelineContext.kt:63)
        at io.ktor.util.pipeline.SuspendFunctionGun$continuation$1.resumeWith(PipelineContext.kt:88)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:45)
        at io.ktor.util.pipeline.SuspendFunctionGun.resumeRootWith(PipelineContext.kt:183)
        at io.ktor.util.pipeline.SuspendFunctionGun.access$resumeRootWith(PipelineContext.kt:63)
        at io.ktor.util.pipeline.SuspendFunctionGun$continuation$1.resumeWith(PipelineContext.kt:88)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:45)
        at kotlinx.coroutines.DispatchedTask.run(Dispatched.kt:234)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:463)
        at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.lang.Thread.run(Thread.java:776)
```

The proguard rules I added:
```
-keep class io.ktor.server.netty.DevelopmentEngine {*;}
-keep class kotlin.reflect.jvm.internal.** {*;}
-keep class kotlin.text.RegexOption {*;}
```

( I ended up disabling proguard altogether :disappointed: )

I had similar issue and the following proguard rule solved my problem.
```-keep class io.ktor.** { *; }```
Did you find a better way?

to be honest I stopped using Ktor altogether in the end. It's simply not meant to be compatible with Android

I see. It seems like it will take more time to be mature. Thanks for the reply.