Invalid method in request application/octet-stream

Jan 17 11:15:31 apachweb01 apache2[19739]: [error] [client
dott.ip.add.ress] Invalid method in request application/octet-stream

recently i started noticing these message getting put into the syslog.
The apache2 server has a whole bunch of virtual hosts, and a small
handful of ssl hosts.

I can't figure out which site these are being generated from. each one
of my virtualhosts has their own access logs - loglevel is set to
emerg for all the virtualhosts. do i just need to make the logging
more detailed for every single virtualhost so i can find the
corresponding log data?

Is there a simpler way to get more details out of the error log?

Thanks!

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