vcl and cache-control header

[Denis Ahrens]

Hi

On 24.04.2007, at 21:19, Poul-Henning Kamp wrote:

> In message <766F093C-6960-4FFB-ACA8-B014184CE85F at zeno.org>, Denis  
> Ahrens writes
> :
>> Hi
>>
>> I have problems with the following vcl-script:
>>
>> 	if(req.http.Cache-Control == "max-age=0") {
>> 		set obj.ttl = 0s;
>> 		pass;
>> 	}
>
> Guys, when you quote VCL code, please also tell us which
> function you do this in...

sorry, this is in vcl_hit()

>> With this snippet in vcl-hit EVERY obj will get fetched (if there is
>> a Cache-Control header or not). Even when I change the code to
>>
>> 	if(req.http.Cache-Control == "thiscanbeneverfound") {
>> 		set obj.ttl = 0s;
>> 		pass;
>> 	}
>>
>> EVERY obj is fetched from the backend.
> Sounds bogus, can you please enable the vcl_trace parameter
> and send me a varnishlog -o output ?

I even changed it to this (the x is intentional!):

	if (req.http.Cache-Controlx == "maxage=0")
         {
                 error 200 "foo";
         }

and it does not deliver anymore because the child is dying.

Cache child died pid=54760 status=0x8b
Clean child
Child cleaned
start child pid 54761
Child said (2, 54761): <<Child starts
managed to mmap 8589934592 bytes of 8589934592
Ready
CLI ready


the first req is fetched and inserted. the second request than crashes
in vcl_hit I think. But since I changed it to Cache-Controlx it should
never match.

some more output:

     0 CLI            Rd ping
     0 CLI            Wr 0 200 PONG 1177502820
     0 WorkThread     0x7fffff1f7ad0 start
    15 BackendOpen  b vladoserver3 212.202.251.211 58294  
212.202.251.213 80
    15 BackendXID   b 142526492
    15 TxRequest    b GET
    15 TxURL        b /Bibliothek/Pierer-1857.images/I/01_0223a.png
    15 TxProtocol   b HTTP/1.1
    15 TxHeader     b Host: www.zeno.org
    15 TxHeader     b Accept: */*
    15 TxHeader     b User-Agent: lukemftp/1.6-beta2
    15 TxHeader     b X-Varnish: 142526492
    15 TxHeader     b X-Forwarded-for: 192.168.128.215
    15 RxProtocol   b HTTP/1.1
    15 RxStatus     b 200
    15 RxResponse   b OK
    15 RxHeader     b Connection: close
    15 RxHeader     b Content-Type: image/png
    15 RxHeader     b Content-Length: 14847
    15 RxHeader     b Cache-control: max-age=3600, s-maxage=86400
    15 RxHeader     b Server: ZenoServer/1.5.16
    15 RxHeader     b Last-Modified: Tue, 17 Apr 2007 18:37:48 +0200
    15 BackendClose b vladoserver3

    12 SessionOpen  c 192.168.128.215 56935
    12 ReqStart     c 192.168.128.215 56935 142526492
    12 RxRequest    c GET
    12 RxURL        c /Bibliothek/Pierer-1857.images/I/01_0223a.png
    12 RxProtocol   c HTTP/1.1
    12 RxHeader     c Host: www.zeno.org
    12 RxHeader     c Accept: */*
    12 RxHeader     c Connection: close
    12 RxHeader     c User-Agent: lukemftp/1.6-beta2
    12 VCL_call     c recv 1 23.1 2 26.13 6 31.9 7 31.13 9 35.9 10  
35.13 11 35.38 13 39.9 14 39.13 15 40.9 16 44.9 17 44.13 19 53.9 20  
53.13 22 58.9 lookup   12 VCL_call     c hash 62 22.14 hash   12  
VCL_call     c miss 33 82.1 34 83.13 36 87.9 fetch
    12 Backend      c 15 vladoserver3
    12 ObjProtocol  c HTTP/1.1
    12 ObjStatus    c 200
    12 ObjResponse  c OK
    12 ObjHeader    c Content-Type: image/png
    12 ObjHeader    c Cache-control: max-age=3600, s-maxage=86400
    12 ObjHeader    c Server: ZenoServer/1.5.16
    12 ObjHeader    c Last-Modified: Tue, 17 Apr 2007 18:37:48 +0200
    12 ObjHeader    c Content-Length: 14847
    12 TTL          c 142526492 RFC 3600 1177502820 0 0 3600 0
    12 VCL_call     c fetch 37 91.1 38 92.13 40 96.9 41 96.13 43  
100.9 44 100.13 46 104.9 insert
    12 Length       c 14847
    12 TxProtocol   c HTTP/1.1
    12 TxStatus     c 200
    12 TxResponse   c OK
    12 TxHeader     c Content-Type: image/png
    12 TxHeader     c Cache-control: max-age=3600, s-maxage=86400
    12 TxHeader     c Server: ZenoServer/1.5.16
    12 TxHeader     c Last-Modified: Tue, 17 Apr 2007 18:37:48 +0200
    12 TxHeader     c Content-Length: 14847
    12 TxHeader     c X-Varnish: 142526492
    12 TxHeader     c Age: 0
    12 TxHeader     c Via: 1.1 varnish
    12 TxHeader     c Connection: close
    12 ReqEnd       c 142526492 1177502820.555715303  
1177502820.563157311 0.000220139 0.007398427 0.000043581

     0 StatAddr       192.168.128.215 0 0 1 1 0 0 1 254 14847
    12 SessionClose c Connection: close
    12 StatSess     c 192.168.128.215 56935 0 1 1 0 0 1 254 14847

     0 CLI            Rd ping
     0 CLI            Wr 0 200 PONG 1177502823
     0 CLI            Rd ping
     0 CLI            Wr 0 200 PONG 1177502826
     0 CLI            Rd vcl.load boot /tmp/vcl.9zsbFdxA
     0 CLI            Wr 0 200 Loaded "/tmp/vcl.9zsbFdxA" as "boot"

     0 CLI            Rd vcl.use boot
     0 CLI            Wr 0 200
     0 CLI            Rd start
     0 CLI            Wr 0 200
     0 CLI            Rd ping
     0 CLI            Wr 0 200 PONG 1177502830