Hi Support, I am having problem with the squid cache on a sepcific URL http://osiris.voicegenie.com:8080/conformance/vxml-srgs-voicegenie/278/record5-pass.vxml. When sending a GET request on this URL, squid cache returns ERR_ZERO_SIZE_OBJECT in 60 seccons, and then squid re-try the request and got "200 OK" immediately. This behavior is consistently reproduciable. The cache.log shows: 2006/08/11 16:26:48| fwdFail: ERR_ZERO_SIZE_OBJECT "Service Unavailable" http://osiris.voicegenie.com:8080/conformance/vxml-srgs-voicegenie/278/record5-pass.vxml Please see the full cache.log in the attachment. I would need help to figure out why ERR_ZERO_SIZE_OBJECT occures at the first try. The squid version is 2.5.STABLE5. Thanks, Katie (Xin) Wang