[streaming-response] Use HttpEndpoint.isOpen() instead of reading a byte from TCP socket (#49460)
* [streaming-response] Use HttpEndpoint.isOpen() instead of reading a byte from TCP socket * Comment out cancellation test
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* [streaming-response] Use HttpEndpoint.isOpen() instead of reading a byte from TCP socket * Comment out cancellation test
mentioned in commit d60ca3d1
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mentioned in commit 4cc73121
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mentioned in commit 121db001