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Progressive rendering not working

See original GitHub issue

Attach (recommended) or Link to PDF file here:

Configuration:

Web browser and its version: Chrome 65.0.3325.181
Operating system and its version: Mac OSX 10.13.3
PDF.js version: 2.0.449
Is a browser extension: no

What is the expected behavior?

I have a linearized PDF, and a server returning accept-ranges: bytes. I expect the PDF to be progressively loaded/rendered, and to observe Range requests with 206 response codes, but instead no Range request is made, and the whole PDF is loaded and rendered in bulk.

I read a lot of other issues and responses related to Range requests, but I still cannot find what is wrong in my setup. CORS headers are OK, Accept-Ranges header is returned by the server, Range requests are supported (as tested with CURL).

Two specific things in my setup are:

accept-ranges is lower case (PDF is on Google Cloud Storage). But headers should be case insensitive.
The original request for the PDF responds with a 302 redirect to the actual file URL. Could this confuse PDFJS, as the redirect does not contain accept-ranges?

As you can see, the Accept-Ranges header is properly returned:

Any idea?

Issue Analytics

State:
Created 5 years ago
Reactions:2
Comments:5

Top GitHub Comments

2reactions

Gabri-connectcommented, May 11, 2018

bump - Having same issue

1reaction

angel-langdoncommented, Jun 30, 2022

Could we get a confirmation one way or another on whether lower-case headers don’t work and should be supported according to the RFC specs?

@kentingnguyen I can confirm you that lowercase headers do not make a difference. I was able to achieve progressive rendering by correctly implementing my backend logic

My backend implementation in Python using range requests, maybe you can translate it to Java https://stackoverflow.com/a/71309270/12234006

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