Improved error messaging when a connection is closed. Fixes #1260.

[millems]

No description provided.

[codecov-io]

Codecov Report

Merging #1263 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #1263      +/-   ##
============================================
- Coverage     70.55%   70.53%   -0.02%     
  Complexity      188      188              
============================================
  Files           776      776              
  Lines         24021    24027       +6     
  Branches       1789     1795       +6     
============================================
  Hits          16948    16948              
- Misses         6285     6294       +9     
+ Partials        788      785       -3

Flag	Coverage Δ	Complexity Δ
#unittests	70.53% <0%> (-0.02%)	188 <0> (ø)

Impacted Files	Coverage Δ	Complexity Δ
.../http/nio/netty/internal/NettyRequestExecutor.java	63.82% <0%> (-1.04%)	0 <0> (ø)
...o/netty/internal/utils/BetterFixedChannelPool.java	54.14% <0%> (-4.98%)	0% <0%> (ø)
...ware/amazon/awssdk/utils/cache/CachedSupplier.java	87.8% <0%> (-2.44%)	0% <0%> (ø)
...on/awssdk/services/kinesis/KinesisRetryPolicy.java	85.71% <0%> (ø)	0% <0%> (ø)	⬇️
...ttp/pipeline/stages/MakeAsyncHttpRequestStage.java	96.8% <0%> (+0.03%)	0% <0%> (ø)	⬇️
.../software/amazon/awssdk/codegen/AddOperations.java	85.33% <0%> (+0.19%)	0% <0%> (ø)	⬇️
...ssdk/auth/credentials/HttpCredentialsProvider.java	58.33% <0%> (+0.58%)	0% <0%> (ø)	⬇️
...signer/internal/AwsChunkedEncodingInputStream.java	47.29% <0%> (+0.67%)	0% <0%> (ø)	⬇️
...mazon/awssdk/core/internal/retry/RetryHandler.java	90.9% <0%> (+2.27%)	0% <0%> (ø)	⬇️
...p/nio/netty/internal/HealthCheckedChannelPool.java	90.47% <0%> (+4.76%)	0% <0%> (ø)	⬇️
... and 1 more

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