SendCountExceedException when accessing S3 bucket in another region via Ktor client

[ianbotsf]

Describe the bug

When attempting to read from an S3 bucket hosted in a different region than the client configuration using the Ktor client engine, the following error is observed:

io.ktor.client.features.SendCountExceedException: Max send count 20 exceeded. Consider increasing the property maxSendCount if more is required.

This error is unintuitive and does not correctly indicate the problem or any possible resolutions.

Expected behavior

The API call should throw a clearer error indicating the problem (missing endpoint configuration and/or incorrect region).

Current behavior

The following error is thrown:

Exception in thread "main" io.ktor.client.features.SendCountExceedException: Max send count 20 exceeded. Consider increasing the property maxSendCount if more is required.
	at io.ktor.client.features.HttpSend$DefaultSender.execute(HttpSend.kt:121)
	at io.ktor.client.features.HttpRedirect$Feature.handleCall(HttpRedirect.kt:95)
	at io.ktor.client.features.HttpRedirect$Feature.access$handleCall(HttpRedirect.kt:47)
	at io.ktor.client.features.HttpRedirect$Feature$handleCall$1.invokeSuspend(HttpRedirect.kt)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at io.ktor.util.pipeline.SuspendFunctionGun.resumeRootWith(SuspendFunctionGun.kt:191)
	at io.ktor.util.pipeline.SuspendFunctionGun.loop(SuspendFunctionGun.kt:147)
	at io.ktor.util.pipeline.SuspendFunctionGun.access$loop(SuspendFunctionGun.kt:15)
	at io.ktor.util.pipeline.SuspendFunctionGun$continuation$1.resumeWith(SuspendFunctionGun.kt:93)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)

Steps to Reproduce

suspend fun main() {
    val globalConfig = AwsClientConfig.fromEnvironment { }
    val s3 = S3Client(globalConfig) {
        httpClientEngine = KtorEngine()
    }
    s3.getObject(GetObjectRequest {
        bucket = "aws-sdk-kotlin-api-docs" // Bucket hosted in another region
        key = "foo"
    }) { }
}

Possible Solution

No response

Context

Originally noted in #525.

AWS Kotlin SDK version used

0.12.0-beta

Platform (JVM/JS/Native)

JVM

Operating System and version

Amazon Linux 2

[ianbotsf]

PR in smithy-kotlin#590.

[ianbotsf]

PR approved and pushed to smithy-kotlin/main. This fix will be in the next SDK release.

[github-actions]

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