This is gap of ~1 min visible in log file:

2013/11/21 00:42:44.246| fwdComplete: server FD -1 not re-forwarding status 503
        status 503
2013/11/21 00:43:45.175| fwdComplete: server FD -1 not re-forwarding status 503
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Also in below lines a two lines showing gap is observed at:
2013/11/21 00:42:44.260| clientReadSomeData: FD 8: reading request...
2013/11/21 00:43:28.921| AuthUser::cacheCleanup: Cleaning the user cache now

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2013/11/21 00:42:44.260| PconnPool::pop: lookup for key {www.naukri.com:80-192.168.5.22} failed.
2013/11/21 00:42:44.260| FilledChecklist.cc(168) ~ACLFilledChecklist: ACLFilledChecklist destroyed 0x7fff61ed2990
2013/11/21 00:42:44.260| ACLChecklist::~ACLChecklist: destroyed 0x7fff61ed2990
2013/11/21 00:42:44.260| fwdConnectStart: got outgoing addr 192.168.5.22, tos 0
2013/11/21 00:42:44.260| comm_openex: Attempt open socket for: 192.168.5.22
2013/11/21 00:42:44.260| comm_openex: Opened socket FD 10 : family=2, type=1, protocol=6
2013/11/21 00:42:44.260| fd_open() FD 10 http://www.naukri.com/
2013/11/21 00:42:44.260| fwdConnectStart: got TCP FD 10
2013/11/21 00:42:44.260| The AsyncCall SomeCloseHandler constructed, this=0x12ca220 [call97241]
2013/11/21 00:42:44.260| comm.cc(1195) commSetTimeout: FD 10 timeout 60
2013/11/21 00:42:44.260| The AsyncCall SomeTimeoutHandler constructed, this=0x13bc920 [call97242]
2013/11/21 00:42:44.260| comm.cc(1206) commSetTimeout: FD 10 timeout 60
2013/11/21 00:42:44.260| The AsyncCall SomeCommConnectHandler constructed, this=0xe37dc0 [call97243]
2013/11/21 00:42:44.260| commConnectStart: FD 10, cb 0xe37dc0*1, www.naukri.com:80
2013/11/21 00:42:44.260| The AsyncCall SomeCloseHandler constructed, this=0x12c7ba0 [call97244]
2013/11/21 00:42:44.260| ipcache_nbgethostbyname: Name 'www.naukri.com'.
2013/11/21 00:42:44.260| ipcache_nbgethostbyname: HIT for 'www.naukri.com'
2013/11/21 00:42:44.260| StoreEntry::unlock: key '5502B1298080D6C371128B36A03F5C69' count=2
2013/11/21 00:42:44.260| FilledChecklist.cc(168) ~ACLFilledChecklist: ACLFilledChecklist destroyed 0xe3d8e8
2013/11/21 00:42:44.260| ACLChecklist::~ACLChecklist: destroyed 0xe3d8e8
2013/11/21 00:42:44.260| FilledChecklist.cc(168) ~ACLFilledChecklist: ACLFilledChecklist destroyed 0xe3d688
2013/11/21 00:42:44.260| ACLChecklist::~ACLChecklist: destroyed 0xe3d688
2013/11/21 00:42:44.260| clientReadSomeData: FD 8: reading request...
2013/11/21 00:43:28.921| AuthUser::cacheCleanup: Cleaning the user cache now
2013/11/21 00:43:28.921| AuthUser::cacheCleanup: Current time: 1385016208
2013/11/21 00:43:28.921| AuthUser::cacheCleanup: Finished cleaning the user cache.
2013/11/21 00:43:29.368| statHistCopy: Dest=0x8e94a8, Orig=0x936168
2013/11/21 00:43:29.368| statHistCopy: capacity 300 300
2013/11/21 00:43:29.368| statHistCopy: min 0.00 0.00
2013/11/21 00:43:29.368| statHistCopy: max 10800000.00 10800000.00
2013/11/21 00:43:29.368| statHistCopy: scale 18.52 18.52
2013/11/21 00:43:29.368| statHistCopy: copying 1200 bytes to 0xc660b0 from 0xd99460
2013/11/21 00:43:29.368| statHistCopy: Dest=0x8e93c8, Orig=0x936088
2013/11/21 00:43:29.368| statHistCopy: capacity 300 300
2013/11/21 00:43:29.368| statHistCopy: min 0.00 0.00