anybody seen this? (POST /PAV_REL HTTP/1.0)

[Paul A Vixie <vixie () vix com>]

while hunting codered, i started seeing quite a few of the following:

        POST /PAV_REL HTTP/1.0
        User-Agent: TSTPAV
        Connection: Keep-Alive
        Content-length: 138
        Pragma: no-cache
        Content-type: application/marimba
        Request-type: update/12

what's being attempted here, and is anybody else seeing it?  sometimes it's

        POST /PAV_REL HTTP/1.1
        Host: ...
        Connection: keep-alive
        User-Agent: TSTPAV
        Content-length: 974
        Pragma: no-cache
        Content-type: application/marimba
        Request-type: update/12
        Via: 1.0 proxy-rnb (NetCache NetApp/5.1D3)
        X-Forwarded-For: ...

i'm not currently collecting the content, maybe i should.  anybody seen this?