Getting Error 200 Guru Mediation Error on Purging using x-key

[Aadarsh-Verma]

I get the following response on purging using x-key

I have used the file storage backend using this : varnishd -F -s disk=file,/var/lib/varnish/varnish_storage.bin,1G -f /etc/varnish/default.vcl -a:6085 and my purging logs are : `

• << Request >> 4
• Begin req 3 rxreq
• Timestamp Start: 1678092742.493797 0.000000 0.000000
• Timestamp Req: 1678092742.493797 0.000000 0.000000
• VCL_use boot
• ReqStart 127.0.0.1 54232 a0
• ReqMethod PURGE
• ReqURL /
• ReqProtocol HTTP/1.1
• ReqHeader x-key: date
• ReqHeader User-Agent: PostmanRuntime/7.29.2
• ReqHeader Accept: /
• ReqHeader Postman-Token: ca71ae56-5438-497b-b7f7-165f64ce98f4
• ReqHeader Host: localhost:8086
• ReqHeader Accept-Encoding: gzip, deflate, br
• ReqHeader Connection: keep-alive
• ReqHeader Content-Length: 0
• ReqHeader X-Forwarded-For: 127.0.0.1
• ReqHeader Via: 1.1 fa063941 (Varnish/7.2)
• VCL_call RECV
• VCL_Log Aadarsh
• ReqHeader n-gone: 0
• VCL_return synth
• ReqUnset Accept-Encoding: gzip, deflate, br
• ReqHeader Accept-Encoding: gzip
• VCL_call HASH
• VCL_Log cookie data in hash function =
• VCL_return lookup
• RespProtocol HTTP/1.1
• RespStatus 200
• RespReason Invalidated 0 objects
• RespHeader Date: Mon, 06 Mar 2023 08:52:22 GMT
• RespHeader Server: Varnish
• RespHeader X-Varnish: 4
• VCL_call SYNTH
• RespHeader Content-Type: text/html; charset=utf-8
• RespHeader Retry-After: 5
• VCL_return deliver
• Timestamp Process: 1678092742.493831 0.000033 0.000033
• RespHeader Content-Length: 281
• Storage malloc Transient
• Filters
• RespHeader Connection: keep-alive
• Timestamp Resp: 1678092742.493866 0.000069 0.000035
• ReqAcct 235 0 235 207 281 488
• End

` Don't know why my storage is malloc Transient in this case when I am using file type storage backend could be the source of the issue

my VCL file is

` sub vcl_recv { if (req.method == "PURGE") {

    if (req.http.x-key) {
    set req.http.n-gone = xkey.purge(req.http.x-key);
    # or: set req.http.n-gone = xkey.softpurge(req.http.xkey)
    return (synth(200, "Invalidated "+req.http.n-gone+" objects"));
    } else {
    return (purge);
    }
 }

}

sub vcl_backend_response { // set beresp.storage = disk; set beresp.ttl = 0s; if(bereq.url ~ "date"){ unset beresp.http.Cache-Control; set beresp.http.Cache-Control = "public"; set beresp.ttl = 10m; set beresp.http.x-key = "date"; std.log("setting cache-control"); } } `

[gquintard]

hi @Aadarsh-Verma ,

this doesn't look like a bug so I'll close this.

[gquintard]

in short:

• you are generating a synthetic response with synth(200, ...) (either directly, or via the default vcl_purge (https://github.com/varnishcache/varnish-cache/blob/master/bin/varnishd/builtin.vcl#L133-L136)), and those are held in the ~transient` storage (https://varnish-cache.org/docs/trunk/users-guide/storage-backends.html#transient-storage)
• the Guru meditation is created by the built-in vcl_synth subroutine (https://github.com/varnishcache/varnish-cache/blob/master/bin/varnishd/builtin.vcl#L173-L191)