src/java.net.http/share/classes/jdk/internal/net/http/Http1Exchange.java

*** 231,241 ****
          if (debug.on()) debug.log("response created in advance");
  
          CompletableFuture<Void> connectCF;
          if (!connection.connected()) {
              if (debug.on()) debug.log("initiating connect async");
!             connectCF = connection.connectAsync();
              Throwable cancelled;
              synchronized (lock) {
                  if ((cancelled = failed) == null) {
                      operations.add(connectCF);
                  }
--- 231,242 ----
          if (debug.on()) debug.log("response created in advance");
  
          CompletableFuture<Void> connectCF;
          if (!connection.connected()) {
              if (debug.on()) debug.log("initiating connect async");
!             connectCF = connection.connectAsync(exchange)
!                     .thenCompose(unused -> connection.finishConnect());
              Throwable cancelled;
              synchronized (lock) {
                  if ((cancelled = failed) == null) {
                      operations.add(connectCF);
                  }