Website OK on Firefox but not on Safari (kCFErrorDomainCFNetwork error 303) neither Chrome (net::ERR_SPDY_PROTOCOL_ERROR)

Question

Since some days, my website won't load on Safari nor Chrome on Mac OS X (at home nor on my clients computers). It's working well on Firefox (Mac OS & Windows) and IE / Edge, but not Chrome (Windows). It was well working before that and was not updated since weeks.

I'm facing this error on Safari

Failed to load resource: The operation couldn’t be completed. (kCFErrorDomainCFNetwork error 303.)

And this one on Chrome

 Failed to load resource: net::ERR_SPDY_PROTOCOL_ERROR

It seem's to be related to HTTP/2 but I don't really know what is the problem.

I saw that a workaround is to clear the cache and cookie. I did and it works on Chrome the first time I load the website, but when I navigate to another page, the error appear again. I also flush opened socket without effects.

On Safari, flushing the cache and cookie has no effects.

My hoster (OVH) tells me that the problem is in my code but I cannot figure out where could be the bug.

Do you have any clue about that ?

Thanks a lot

Answer 1

We have had a problem with nginx and HTTP/2 which resulted in the same error in Safari and a similar error in Internet Explorer.

When we tweaked the nginx buffers to be:

http2_max_field_size 16k;
http2_max_header_size 128k;

the issue was gone.

Answer 2

My problem was disappearing after reloading the page. So it always shows the error on the first load after nginx reload. Error log shown:

2018/10/21 06:26:54 [crit] 9439#9439: *54 open() "/var/cache/nginx/proxy_temp/2/01/0000000012" failed (13: Permission denied) while reading upstream, client: 37.9.113.93, server: anvileight.com, request: "GET /ar/ HTTP/1.1", upstream: "http://unix:/run/a8/gunicorn.sock:/ar/", host: "anvileight.com"

My problem was that nginx has directive:

user       deploy deploy;

and indeed, permissions on that folder were incorrect:

ll /var/cache/nginx/proxy_temp
total 40K
drwx------ 102 www-data www-data 4.0K Jan  6  2018 0
drwx------ 102 www-data www-data 4.0K Jan  6  2018 1

When I changed it to

user       www-data www-data;

problem has gone