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kotlinlang

Hello. I am currently struggling with another issue regarding Kotlin MPP.

I am unable to successfully execute a request using Ktor on iOS. It always throws an InvalidMutabilityException. I have a vague understanding of the mutability aspect, but can't figure out why it's being thrown on Ktor.

From iOS
```
kotlin.native.concurrent.InvalidMutabilityException: mutation attempt of frozen io.ktor.client.request.HttpRequestPipeline@3f59548
```
I've tried downgrading to Kotlin 1.3.10, as that seemed to be suggested on SO. However, it still throws the same exception.

Kotlin 1.3.11/10
Ktor 1.1.1
Coroutines 1.1.0

I had the same issue. Downgrading to kotlin 1.3.10 worked for me. Although i was using Ktor 1.0.1 and Coroutines 1.0.1 also.

<@UFK5SFGDB> did you resolve this?  also seeing this with kotlin 1.3.21 ktor 1.1.3 coroutines 1.1.1

<@UFJHSSZBR> I think I did figure it out on my end. I believe it was because my Ktor client was being held in a global object

Aka static, so couldn't be shared/mutated across threads

in my case I was not using the mainthread on iOS.  I had to switch to using a CoroutineDispatcher that dispatches everything on the main queue.