docs: protected void completeConnectionPreface() throws Http2Exception {
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
              Tr.debug(tc, "completeConnectionPreface entry: about to send preface SETTINGS frame");
          }
          FrameSettings settings;
          // send out a settings frame with any HTTP2 settings that the user may have changed
          if (Constants.SPEC_INITIAL_WINDOW_SIZE != this.streamReadWindowSize) {
              settings = new FrameSettings(0, -1, -1, this.muxLink.config.getH2MaxConcurrentStreams(), (int) this.streamReadWindowSize, this.muxLink.config.getH2MaxFrameSize(), -1, false);
          } else {
              settings = new FrameSettings(0, -1, -1, this.muxLink.config.getH2MaxConcurrentStreams(), -1, this.muxLink.config.getH2MaxFrameSize(), -1, false);
          }
  
          this.frameType = FrameTypes.SETTINGS;
          this.processNextFrame(settings, Direction.WRITING_OUT);
  
          if (Constants.SPEC_INITIAL_WINDOW_SIZE != muxLink.maxReadWindowSize) {
              // the user has changed the max connection read window, so we'll update that now
              FrameWindowUpdate wup = new FrameWindowUpdate(0, (int) muxLink.maxReadWindowSize, false);
              this.processNextFrame(wup, Direction.WRITING_OUT);
          }
      }