RFR: 8314978: Multiple server call from connection failing with expect100 in getOutputStream

[Vyom Tewari]

With the current implementation of HttpURLConnection  if server rejects the  “Expect 100-continue” then there will be ‘java.net.ProtocolException’ will be thrown from 'expect100Continue()' method. 

After the exception thrown, If we call any other method on the same instance (ex getHeaderField(), or getHeaderFields()). They will internally call getOuputStream() which invokes writeRequests(), which make the actual server call.

The code change will sets the existing variable ‘rememberedException’ when there is exception and getOutputStream0() will re-throw ‘rememberedException’  if the ‘rememberedException’ is not null. 

Note: getOutputStream0() also call’s  ‘expect100Continue()’  if ‘expectContinue’ is true.

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Commit messages:
 - 8314978: Multiple server call from connection failing with expect100 in getOutputStream

Changes: https://git.openjdk.org/jdk/pull/15483/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15483&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314978
  Stats: 257 lines in 2 files changed: 257 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15483.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15483/head:pull/15483

PR: https://git.openjdk.org/jdk/pull/15483