code: private void nextChunk() throws IOException {
          if (!this.bof) {
              this.readCrlf();
          }
          this.size = ChunkedInputStream.chunkSize(this.origin);
          this.bof = false;
          this.pos = 0;
          if (this.size == 0) {
              this.eof = true;
          }
      }
docs: Read the next chunk.
  @throws IOException If an IO error occurs.