Hi Jonathan, Thank you for the links, but I already read them (and that's why I added the WSGIChunkedRequest parameter to mod_wsgi configuration).
After searching a while and making many tests, the problem doesn't seem to be at the application level, but at the system level! I use an NFS share with cachefilesd on my web frontends to store external files (I use ZODB blobs with Relstorage), and it's probably this component which doesn't work as expected; if I get access to these resources through the server where files are stored (on which the web application is also deployed), it works and performances are as expected. I'm now trying to find the origin of this NFS performance problem; if I can't make it work correctly, maybe I'll switch to Relstorage blobs stored in the PostgreSQL ZODB backend (with a RelStorage client cache), but this configuration generates very big PostgreSQL databases (I have 800 GB of data files) which are quite hard to handle... Best regards, Thierry -- https://www.ulthar.net -- http://pyams.readthedocs.io Le mar. 26 août 2025 à 01:07, Jonathan Vanasco <jvana...@gmail.com> a écrit : > Have you seen these? > > https://github.com/GrahamDumpleton/mod_wsgi/issues/312 > > and > > > https://modwsgi.readthedocs.io/en/develop/configuration-directives/WSGIChunkedRequest.html > > > On Friday, August 22, 2025 at 8:58:43 PM UTC-4 Thierry Florac wrote: > >> Hi, >> >> My Pyramid application is supporting partial contents transfer for >> requests using "range" headers, actually to serve PDF and videos files. >> >> The application is deployed behind an HAProxy with Apache and mod_wsgi; >> after using this feature without any problem for years (with Apache 2.4.25, >> mod_wsgi 4.5.11 and Python 3.5), I add to upgrade my configuration recently >> (with Apache 2.4.62, mod_wsgi 4.9.4 and Python 3.11) and I now get errors >> in Apache logs: >> >> >>> Received request requiring chunked transfer encoding, but optional >> support for chunked transfer encoding has not been enabled. >> >> I found references to topics saying that WSGI protocol doesn't support >> chunked transfer encoding natively, and to a configuration directive >> (WSGIChunkedRequest) that I added to my Apache configuration. Now the error >> disappeared, but files download is still really very very long! >> >> Would you have any idea about the origin of this issue? >> >> Best regards, >> Thierry >> -- >> https://www.ulthar.net -- http://pyams.readthedocs.io >> > -- > You received this message because you are subscribed to the Google Groups > "pylons-discuss" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to pylons-discuss+unsubscr...@googlegroups.com. > To view this discussion visit > https://groups.google.com/d/msgid/pylons-discuss/b15cc5bf-ab90-4875-9fd0-b7b987c56478n%40googlegroups.com > <https://groups.google.com/d/msgid/pylons-discuss/b15cc5bf-ab90-4875-9fd0-b7b987c56478n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "pylons-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to pylons-discuss+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/pylons-discuss/CAPX_VWB7Rein2yj825wBADkj-_eHP2_tRLRKUgMrLqTyRcVSqw%40mail.gmail.com.
