8364733: HttpClient: sendAsync throws unspecified exceptions

[vy]

Ensure that HttpClient::sendAsync transforms exceptions thrown by request publishers into IOExceptions, as required by the specification.

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Issue

• JDK-8364733: HttpClient: sendAsync throws unspecified exceptions (Bug - P4)

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[liach]

I don't think we need to add new throws Exception declarations if the existing code does not need it.

[vy]

I don't think we need to add new throws Exception declarations if the existing code does not need it.

@liach, I've did some cleaning in 89dba9a. Let me know if you were concerned about more places.