[squid-users] cache.log errors

What can be the cause of these errors in my cache.log?

2009/08/31 07:35:02| storeDirWriteCleanLogs: Starting...
2009/08/31 07:35:02| Finished. Wrote 6991 entries.
2009/08/31 07:35:02| Took 0.0 seconds (2124924.0 entries/sec).
2009/08/31 07:35:02| logfileRotate: /var/log/squid/store.log
2009/08/31 07:35:02| logfileRotate (stdio): /var/log/squid/store.log
2009/08/31 07:35:02| logfileRotate: /var/log/squid/access.log
2009/08/31 07:35:02| logfileRotate (stdio): /var/log/squid/access.log
2009/08/31 07:35:02| helperOpenServers: Starting 7 'python' processes
2009/08/31 07:46:38| sslReadClient: FD 36: read failure: (110)
Connection timed out
2009/08/31 08:17:16| clientTryParseRequest: FD 27 (10.0.0.50:37271)
Invalid Request
2009/08/31 08:19:57| parseHttpRequest: Unsupported method '
'
2009/08/31 08:19:57| clientTryParseRequest: FD 27 (10.0.0.50:49041)
Invalid Request
2009/08/31 08:20:37| parseHttpRequest: Unsupported method '
'
2009/08/31 08:20:37| clientTryParseRequest: FD 19 (10.0.0.50:49043)
Invalid Request
2009/08/31 08:20:55| parseHttpRequest: Unsupported method '
'
2009/08/31 08:20:55| clientTryParseRequest: FD 27 (10.0.0.50:49044)
Invalid Request
2009/08/31 08:21:33| parseHttpRequest: Unsupported method '
'
2009/08/31 08:21:33| clientTryParseRequest: FD 29 (10.0.0.50:49046)
Invalid Request
2009/08/31 08:21:49| parseHttpRequest: Unsupported method '
'
2009/08/31 08:21:49| clientTryParseRequest: FD 29 (10.0.0.50:49047)
Invalid Request
2009/08/31 08:26:17| sslReadClient: FD 32: read failure: (110)
Connection timed out
2009/08/31 08:31:16| clientTryParseRequest: FD 26 (10.0.0.50:56244)
Invalid Request
2009/08/31 08:31:37| parseHttpRequest: Unsupported method '
'
2009/08/31 08:31:37| clientTryParseRequest: FD 26 (10.0.0.50:56246)
Invalid Request
2009/08/31 08:32:26| clientTryParseRequest: FD 26 (10.0.0.50:56249)
Invalid Request
2009/08/31 08:32:44| clientTryParseRequest: FD 26 (10.0.0.50:56250)
Invalid Request
2009/08/31 08:47:47| parseHttpRequest: Unsupported method '
'
2009/08/31 08:47:47| clientTryParseRequest: FD 29 (10.0.0.50:59602)
Invalid Request
2009/08/31 08:48:07| clientTryParseRequest: FD 27 (10.0.0.50:48984)
Invalid Request
2009/08/31 09:28:13| sslReadClient: FD 25: read failure: (110)
Connection timed out
2009/08/31 14:53:25| parseHttpRequest: Unsupported method '
CONNECT'
2009/08/31 14:53:25| clientTryParseRequest: FD 26 (10.0.0.50:2653)
Invalid Request
2009/08/31 17:15:30| sslReadClient: FD 28: read failure: (110)
Connection timed out
2009/08/31 17:51:08| sslReadClient: FD 25: read failure: (110)
Connection timed out
2009/08/31 18:53:01| WARNING: Disk space over limit: 102724 KB > 102400 KB
2009/08/31 22:48:29| parseHttpRequest: Unsupported method '
'
2009/08/31 22:48:29| clientTryParseRequest: FD 31 (10.0.0.50:45807)
Invalid Request
2009/08/31 22:53:31| clientTryParseRequest: FD 32 (10.0.0.50:47779)
Invalid Request
2009/08/31 22:57:56| clientTryParseRequest: FD 44 (10.0.0.50:47808)
Invalid Request
2009/08/31 23:00:40| clientTryParseRequest: FD 30 (10.0.0.50:55705)
Invalid Request
2009/08/31 23:10:32| clientTryParseRequest: FD 19 (10.0.0.50:50205)
Invalid Request
2009/08/31 23:14:45| clientTryParseRequest: FD 28 (10.0.0.50:60430)
Invalid Request
2009/08/31 23:18:35| clientTryParseRequest: FD 31 (10.0.0.50:33908)
Invalid Request
Received on Tue Sep 01 2009 - 12:39:21 MDT