extend exception message if connection via proxyServer couldn't be es… #1034
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…tablished
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sbt compile
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sbt test
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Issue #1031 (comment)
We use sttp with okhttpbackaend to connect external service via proxy.
Sometimes SttpBackendOptions fired UnsupportedOperationException without any message from IOException.
This change could help to find the reason why the connection could not be established.