20 Byte served

[Anand]

Hi,
Recently we see a weird problem surfaced while serving contents from varnish. A 20 Byte response is seen in the varnish logs whereas no genuine apache request log is seen on the origin server. Suspect is that we receive first 20 Byte response form origin servers and then the connection gets closed but the response is cached as 200 OK and thereafter all request failed because of incorrectly cached content. Below is trace of such event; can someone go through to help me understand the cause. 




136
SessionOpen  c 10.50.252.5 4319 :80

  136 ReqStart     c 10.50.252.5 4319 1560877350

  136 RxRequest    c GET

  136 RxURL        c /vi/ent/gi60s-4-/230987

  136 RxProtocol   c HTTP/1.1

  136 RxHeader     c Host: rest.anand.com

  136 RxHeader     c Pragma: no-cache

  136 RxHeader     c Accept: */*

  136 RxHeader     c Accept-Encoding: deflate, gzip

  136 RxHeader     c Referer: http://world.anand.com

  136 RxHeader     c Connection: Close

  136 RxHeader     c Cipher-Suite:

  136 RxHeader     c SSL-Version: 0

  136 RxHeader     c Cipher-Bits: 0

  136 VCL_call     c recv

  136 VCL_acl      c MATCH purge 10.50.0.0/16

  136 VCL_return   c lookup

  136 VCL_call     c hash

  136 Hash         c /vi/ent/gi60s-4-/230987

  136 Hash         c rest.is.anand.com

  136 VCL_return   c hash

  136 VCL_call     c miss fetch

  136 Backend      c 42 isharerest isharerest[1]

  136 TTL          c 1560877350 RFC 120 -1 -1 1360686521
0 1360686464 0 0

  136 VCL_call     c fetch

  136 TTL          c 1560877350 VCL 2592000 -1 -1 1360686521
-0

  136 VCL_return   c deliver

  136 ObjProtocol  c HTTP/1.1

  136 ObjResponse  c OK

  136 ObjHeader    c Date: Tue, 12 Feb 2013 16:27:44 GMT

  136 ObjHeader    c Server: Apache

  136 ObjHeader    c X-Powered-By: PHP/5.1.4

  136 ObjHeader    c Content-Encoding: gzip

  136 ObjHeader    c Last-Modified: Tue, 12 Feb 2013 16:28:40
GMT

  136 ObjHeader    c cache-control: max-age=2592000

  136 ObjHeader    c Content-Type: text/html; charset=utf-8

  136 Gzip         c u F - 20 0 80 80 90

  136 VCL_call     c deliver deliver

  136 TxProtocol   c HTTP/1.1

  136 TxStatus     c 200

  136 TxResponse   c OK

  136 TxHeader     c Content-Encoding: gzip

  136 TxHeader     c Last-Modified: Tue, 12 Feb 2013 16:28:40
GMT

  136 TxHeader     c cache-control: max-age=2592000

  136 TxHeader     c Content-Type: text/html; charset=utf-8

  136 TxHeader     c Content-Length: 20

  136 TxHeader     c Accept-Ranges: bytes

  136 TxHeader     c Date: Tue, 12 Feb 2013 16:28:40 GMT

  136 TxHeader     c Connection: close

  136 TxHeader     c X-Served-By: cdnserver

  136 TxHeader     c Server: Rediff/3.0.2

  136 TxHeader     c X-Cache: TCP_MISS

  136 Length       c 20

  136 ReqEnd       c 1560877350 1360686520.826237917
1360686520.841027975 0.000053883 0.004394054 0.010396004
Regards,

Anand Shah

A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty.

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