When request content in chunks, PapaParse may trigger HTTP 416 (Range Not Satisfiable) Error under the following two situation:

• we always calculate end as: var end = this._start + this._config.chunkSize - 1; see here. This likely always make the last chunk request to request a range that is beyond the actual file size (unless the actual last chunk size is just equal to the this._config.chunkSize.) Many servers will response HTTP 416 error for this.
  • Solution: use Content-Range header to retrieve the actual file size and use actual content size - 1 as the end for the last chunk
• As we often don't know the actual size of the target file before we request it, it's possible the this._config.chunkSize is configured to a size that is larger than the file size. e.g. the file is only 100 bytes and this._config.chunkSize is configured to 64KB. When this happens, PapaParse will always fail on the first chunk request due to HTTP 416 (Range Not Satisfiable) Error
  • Solution: we should retry (only once) on the first chunk request without Range header on 416 error