src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/AsyncSSLDelegate.java

*** 194,204 ****
       * into it until handshaking completes.
       *
       * This same method is called to try and resume output after a blocking
       * handshaking operation has completed.
       */
!     private void upperWrite(ByteBufferReference[] refs, AsyncWriteQueue delayCallback) {
          // currently delayCallback is not used. Use it when it's needed to execute handshake in another thread.
          try {
              ByteBuffer[] buffers = ByteBufferReference.toBuffers(refs);
              int bytes = Utils.remaining(buffers);
              while (bytes > 0) {
--- 194,204 ----
       * into it until handshaking completes.
       *
       * This same method is called to try and resume output after a blocking
       * handshaking operation has completed.
       */
!     private boolean upperWrite(ByteBufferReference[] refs, AsyncWriteQueue delayCallback) {
          // currently delayCallback is not used. Use it when it's needed to execute handshake in another thread.
          try {
              ByteBuffer[] buffers = ByteBufferReference.toBuffers(refs);
              int bytes = Utils.remaining(buffers);
              while (bytes > 0) {
*** 228,237 ****
--- 228,240 ----
              ByteBufferReference.clear(refs);
          } catch (Throwable t) {
              closeExceptionally(t);
              errorHandler.accept(t);
          }
+         // We always return true: either all the data was sent, or
+         // an exception happened and we have closed the queue.
+         return true; 
      }
  
      // Connecting at this level means the initial handshake has completed.
      // This means that the initial SSL parameters are available including
      // ALPN result.