internalstart Error

Anyone know what the internalStart: unknown request error means? Running
2.2STABLE5 on Solaris 2.6 with cache digests.

2000/01/31 08:43:47| Finished rebuilding storage disk.
2000/01/31 08:43:47| 46546 Entries read from previous logfile.
2000/01/31 08:43:47| 0 Entries scanned from swap files.
2000/01/31 08:43:47| 0 Invalid entries.
2000/01/31 08:43:47| 0 With invalid flags.
2000/01/31 08:43:47| 46546 Objects loaded.
2000/01/31 08:43:47| 0 Objects expired.
2000/01/31 08:43:47| 0 Objects cancelled.
2000/01/31 08:43:47| 0 Duplicate URLs purged.
2000/01/31 08:43:47| 0 Swapfile clashes avoided.
2000/01/31 08:43:47| Took 14 seconds (3324.7 objects/sec).
2000/01/31 08:43:47| Beginning Validation Procedure
2000/01/31 08:43:48| internalStart: unknown request:
GET /squid-internal-periodic/store_digest HTTP/1.0
If-Modified-Since: Mon, 31 Jan 2000 13:13:58 GMT
Accept: application/cache-digest
Accept: text/html
Via: 0.0 proxy2.highmark.com:9119 (Squid/2.2.STABLE5)
X-Forwarded-For: unknown
Host: proxy1.highmark.com:9119
Cache-Control: max-age=259200
Connection: keep-alive

-- 
Jim Richey
jrichey@highmark.com
Highmark, Inc.
http://www.highmark.com