RFR: 8299018: java/net/httpclient/HttpsTunnelAuthTest.java fails with java.io.IOException: HTTP/1.1 header parser received no bytes

[Daniel Fuchs]

Please find here a trivial fix for a test issue in the HttpClient test's ProxyServer.

The ProxyServer has a bad printf that throws an IllegalFormatConversionException, which causes the proxy to close the connection after sending a 407 request. Depending on timing, the client might attempt to reuse the closed (or soon to be closed) connection for sending authentication, which then gets the next POST request to fail.

This failure is rare and intermittent (the client usually gets the close notification before it reuses the connection), but sometimes it doesn't.

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Commit messages:
 - 8299018

Changes: https://git.openjdk.org/jdk/pull/11717/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11717&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299018
  Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/11717.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11717/head:pull/11717

PR: https://git.openjdk.org/jdk/pull/11717