nginx 499's returned for apache 200's

[P. Tour]

hi all,

i've read through the posts regarding 499s and i know it's meant for
"client closed connections" but it's happening way too often for that to
be the case.  i'm seeing it at a frequency of around 10-15% of all of my
response (rough estimate based on access log).

i have one nginx box with several apache servers behind it.
load on all servers (nginx, apache, db, etc) are all low
no errors on either nginx or apache
the only symptoms i see are the frequent 499s

i'm not too sure what to look at next.  what else can cause a 499?  any
ideas?

thanks!
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