Mailing List Archive: [Bug 63839] DeflateBufferSize has no effect on Content-Length header, docs say it should

[Bug 63839] DeflateBufferSize has no effect on Content-Length header, docs say it should

Oct 18, 2019, 12:15 AM

Post #1 of 3 (193 views)

https://bz.apache.org/bugzilla/show_bug.cgi?id=63839

Joe Orton <jorton@redhat.com> changed:

What |Removed |Added
----------------------------------------------------------------------------
OS| |All

--- Comment #1 from Joe Orton <jorton@redhat.com> ---
Content-Length will be set by the content-length filter in cases where the
entire response content can be determined without buffering - earlier 2.4.x
releases did more buffering than was safe so this may have changed in recent
releases. A simple test has got C-L still generated in at least this case:

# dd if=/dev/zero of=/var/www/html/1K0.html bs=1024 count=1
# curl --compressed -v http://localhost/1K0.html > /dev/null
...
< Content-Encoding: gzip
< Content-Length: 29

So it might depend how mod_wsgi generates the response.

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[Bug 63839] DeflateBufferSize has no effect on Content-Length header, docs say it should [ In reply to ]

bugzilla at apache

Oct 18, 2019, 12:22 AM

Post #2 of 3 (193 views)

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https://bz.apache.org/bugzilla/show_bug.cgi?id=63839

--- Comment #2 from Joe Orton <jorton@redhat.com> ---
You could try inserting the BUFFER output filter before mod_deflate

AddOutputFilterByType BUFFER;DEFLATE text/html

if that fixes the problem it's a problem in how mod_wsgi generates content, you
may need some manual buffering somewhere to fix it. Note that mod_buffer
buffers 128K by default which may or may not be optimal for your application.

https://httpd.apache.org/docs/2.4/mod/mod_buffer.html

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[Bug 63839] DeflateBufferSize has no effect on Content-Length header, docs say it should [ In reply to ]

bugzilla at apache

Oct 18, 2019, 4:37 AM

Post #3 of 3 (193 views)

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https://bz.apache.org/bugzilla/show_bug.cgi?id=63839

Michael Schlenker <msc@contact.de> changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INVALID

--- Comment #3 from Michael Schlenker <msc@contact.de> ---
I can confirm it works with static files.
So there must be something broken on the mod_wsgi side.

Thanks for the hint about mod_buffer.

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