code: final void forEachActiveStream(final Http2FrameStreamVisitor streamVisitor) throws Http2Exception {
          assert ctx.executor().inEventLoop();
  
          connection().forEachActiveStream(new Http2StreamVisitor() {
              @Override
              public boolean visit(Http2Stream stream) {
                  try {
                      return streamVisitor.visit((Http2FrameStream) stream.getProperty(streamKey));
                  } catch (Throwable cause) {
                      onError(ctx, false, cause);
                      return false;
                  }
              }
          });
      }
docs: Iterates over all active HTTP/2 streams.
  
  <p>This method must not be called outside of the event loop.