RFR: 8255227: java/net/httpclient/FlowAdapterPublisherTest.java intermittently failing with TestServer: start exception: java.io.IOException: Invalid preface

[Daniel Fuchs]

Hi,

I stumbled on an issue in Stream.java where an assert was misplaced, preventing the proper IOException to be triggered. I believe this is what caused the FlowAdapterPublisherTest.java  to fail with the "Invalid Preface" error on the server side.
In any case - I haven't observed this error again after tweaking the assert.

I have also updated the server side to print better diagnostic in case the Invalid Preface strikes again in the future...

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Commit messages:
 - 8255227: java/net/httpclient/FlowAdapterPublisherTest.java intermittently failing with TestServer: start exception: java.io.IOException: Invalid preface

Changes: https://git.openjdk.java.net/jdk/pull/3813/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3813&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255227
  Stats: 11 lines in 2 files changed: 6 ins; 1 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3813.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3813/head:pull/3813

PR: https://git.openjdk.java.net/jdk/pull/3813