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Ktor client (Apache) seems to have got into a bad state - any likely causes? Stacktrace attached.

``` java.lang.IllegalStateException: Request cannot be executed; I/O reactor status: STOPPED
 	at org.apache.http.util.Asserts.check(Asserts.java:46)
 	at org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase.ensureRunning(CloseableHttpAsyncClientBase.java:90)
 	at org.apache.http.impl.nio.client.InternalHttpAsyncClient.execute(InternalHttpAsyncClient.java:123)
 	at org.apache.http.impl.nio.client.CloseableHttpAsyncClient.execute(CloseableHttpAsyncClient.java:68)
 	at io.ktor.client.engine.apache.ApacheHttpRequestKt.sendRequest(ApacheHttpRequest.kt:50)
 	at io.ktor.client.engine.apache.ApacheEngine.execute(ApacheEngine.kt:23)
 	at io.ktor.client.engine.HttpClientEngine$install$1.invokeSuspend(HttpClientEngine.kt:49)
 	at io.ktor.client.engine.HttpClientEngine$install$1.invoke(HttpClientEngine.kt)
 	at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:268)```

No obvious logging to suggest anything was closing down. Ktor version 1.2.4

I've had that too but never figured out why it was happening.

Not having time to debug that, I ended up switching to the CIO client. Which has its own issues but seems to generally work well.

Thanks <@U0NT624JZ>, this is the first time I've seen it, but haven't been using it long.
That makes me a bit nervous about using the Apache client in production - anyone got any idea what could have happened?

I was assuming the Apache client would be pretty well tested and widely used

If you google that error, all you really find is that the Apache client should never get into that state. So its almost certainly a problem with how Ktor is using it.

I've used the Apache client on its own pretty extensively and never had that issue.

Yeah, likewise - would be interested in hearing from people who do use the Apache client, or whether others have hit the same error.

Hi <@UFR5SUWUR>, it usually happens when the client is canceled or closed, but there are pending requests there.

<https://github.com/ktorio/ktor/issues/1449>
Apologies if I'm just using the client in an unintended way or something

Ugh. Was just me being stupid :disappointed: closed the issue

>  I had passed an HttpClient instance rather than the provider and was trying to reuse a single instance.
Just curious: into what? The `Apache` object into the `HttpClient` constructor function?

I have a DAO and pass it a client provider lambda. It creates a client while handling a particular request and uses it to make one request itself (calling httpClient.use{}, which closes the client).
I pass the lambda at construction so that test instances can use a test HttpClient implementation which doesn't send any request. But instead of passing the provider, I passed the instance - a refactoring fail. But the client would work for one call, so wasn't immediately obvious it was broken.

Ah ok, thanks for the explanation. I don't believe that was my situation, but since I haven't used the Apache client in months, I'd have to go spelunking through our git history to check.