docs: @Benchmark
    @BenchmarkMode(Mode.SampleTime)
    @OutputTimeUnit(TimeUnit.NANOSECONDS)
    public ByteBuf encodeClientHeaders() throws Exception {
      scratchBuffer.clear();
      Http2Headers headers =
          Utils.convertClientHeaders(metadata, scheme, defaultPath, authority, Utils.HTTP_METHOD,
              userAgent);
      headersEncoder.encodeHeaders(1, headers, scratchBuffer);
      return scratchBuffer;
    }