Range requests are broken when RANGE_CHUNK_SIZE != 64k

[CodingFabian]

We just noticed that PDF loaded via range requests no longer work in Safari and Chrome
I will investigate and update this ticket. I also so that disableRange is no longer working. Maybe its related to the streaming improvements?
It does work with firefox.

[CodingFabian]

i suspect #5402 being faulty @yurydelendik

[CodingFabian]

I narrowed it down. for our build we set
RANGE_CHUNK_SIZE = 262144;

Once we reverted to 65536 it was working again.
I suspect there might be an assumption about this value.

[yurydelendik]

This report is a little bit confusing:

1. Refactors PdfDataLister buffering. #5402 is not related to generic viewer and affects only Firefox extension
2. range requests never worked for Safari due to caching bug in the browser
3. STR are not provided

We don't turn on range requests for small files due to HTTP handling overhead. Please provide more details, e.g. example online and steps to reproduce.

[yurydelendik]

See

pdf.js/src/core/worker.js

Line 113 in 878fad4

if (length <= 2 * RANGE_CHUNK_SIZE) {

for small file check.

[CodingFabian]

sorry Yury, I was a bit stressed out because on production no pdfs were showing anymore.
Disabling Range request by filtering the accept-Ranges header made them work.
#disableRange=true was not working.

This was observed in Chrome, where I can confirm that all chunks were downloaded, but the rendering broke. The file was 600k, so it required multiple range requests to download.

After removing our modification of the range chunk size there were more range requests but the document was then rendering fine.
I wont be able to provide a better STR until next weekend, but wanted to give you an early warning of something broken with range requests.

[CodingFabian]

I am going to close the issue until I have STR

[CodingFabian]

I need to apologize. it was not caused by pdfjs but changes in our backend when doing decryption for range requests. it was not showing fro smaller ranges but bigger caused problems. sorry for any troubles caused.