Some HTTP clients only receive first 4k
Scott Stevenson
scott at maxify.com
Mon May 23 12:06:07 PDT 2005
This is a follow-up to a post back in February.
<http://www.monkey.org/freebsd/archive/freebsd-questions/200502/
msg03071.html>
Summary: Certain HTTP clients only receive partial file contents. The
majority of visitors have no problems, but those that do seem to
experience it 100% of the time.
After looking into this further, I've discovered some interesting
data points:
1. Affected clients consistently receive only the first 4096 bytes
of .html and .css files. After that, they encounter a single garbage
character (looks like a memory stomp), and then nothing.
2. At least two of the sites hosted on the machine are affected.
3. The issue can be reproduced via the W3 validator:
<http://validator.w3.org/check?uri=http%3A%2F%2Fcocoadevcentral.com%
2Farticles%2F000085-test.html&charset=%28detect+automatically%
29&doctype=%28detect+automatically%29&ss=1>
The bottom of this page shows the first 4k that was successfully
fetched. It stops right in the middle of a tag. The same thing
happens with this css file:
<http://jigsaw.w3.org/css-validator/validator?uri=http%3A%2F%
2Fcocoadevcentral.com%2Fcss%
2Fcocoadevcentral-20050401.css&usermedium=all>
4. At least in the case of the validator, the requests don't show up
in Apache's access or error logs! This is consistently reproducible.
5. For some reason, clients consistently only get to byte 3883 (or
perhaps 3884) in .php files, and then get the garbage character.
These same sites were previously running on the same network with the
same version of apache. I've done hours of googling and also searched
the freebsd-questions mailing list archives. I've gone out of my way
to keep the installation as vanilla as possible. The system
configuration is essentially:
FreeBSD 5.3-Release
Apache 2.0.50
PHP 5.0.2
Thanks,
- Scott
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