Expect-continue doesn't seem operative using 4.3.x builder structures

[Karl Wright]

Hi Oleg,

A few months back, if you will recall, I ported much of ManifoldCF to use
the HttpClient 4.3 builder structures for its various connectors.

Unfortunately, one thing we'd previously fixed came unfixed when I did
this.  We have a user who has a site that is being posted to that requires
basic auth.  We were getting an exception with HttpClient 4.2 having to do
with non-repeatable request entities.  We solved that by turning on
expect-continue.

For 4.3, we still have expect-continue on, but now we are getting similar
problems:

>>>>>>

Caused by: org.apache.http.client.NonRepeatableRequestException:
Cannot retry request with a non-repeatable request entity.
        at 
org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:208)
        at 
org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:195)
        at 
org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:108)
        at 
org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:186)
>>>>>>

The code used to set up HttpClient looks like this:

>>>>>>
    RequestConfig.Builder requestBuilder = RequestConfig.custom()
      .setCircularRedirectsAllowed(true)
      .setSocketTimeout(socketTimeout)
      .setStaleConnectionCheckEnabled(true)
      .setExpectContinueEnabled(true)
      .setConnectTimeout(connectionTimeout)
      .setConnectionRequestTimeout(socketTimeout);

      HttpClientBuilder clientBuilder = HttpClients.custom()
        .setConnectionManager(connectionManager)
        .setMaxConnTotal(1)
        .disableAutomaticRetries()
        .setDefaultRequestConfig(requestBuilder.build())
        .setRedirectStrategy(new DefaultRedirectStrategy())
        .setSSLSocketFactory(myFactory)
        .setRequestExecutor(new HttpRequestExecutor(socketTimeout))
        .setDefaultSocketConfig(SocketConfig.custom()
          .setTcpNoDelay(true)
          .setSoTimeout(socketTimeout)
          .build()
        );


    if (userID != null && userID.length() > 0 && password != null)
    {
      CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
      Credentials credentials = new
UsernamePasswordCredentials(userID, password);
      if (realm != null)
        credentialsProvider.setCredentials(new
AuthScope(AuthScope.ANY_HOST, AuthScope.ANY_PORT, realm),
credentials);
      else
        credentialsProvider.setCredentials(AuthScope.ANY, credentials);

      clientBuilder.setDefaultCredentialsProvider(credentialsProvider);
    }

    HttpClient localClient = clientBuilder.build();
<<<<<<

Wire logs show *no* expect/continue at all taking place.  Can you tell
me what we are doing wrong?

Thanks,
Karl