CODEWITHSUNDEEP
varnishvarnish-vcl
Zefferno
Zefferno

Reputation: 85

How to ignore big cookies in varnish

I want to ignore requests with big cookie size. We have some requests dropped in varnish due to "BogoHeader Header too long: Cookie: xyz". How can it be done in VCL? I didn't find any len, length or strlen function in VCL, I know that it can be done in the vcl_rcev phase.

Upvotes: 1

Views: 1122

Answers (1)

Carlos Abalde
Carlos Abalde

Reputation: 1087

The strlen() feature won't help to fix your problem. Varnish discards the request due to the large Cookie header before vcl_recv is executed. If you don't want those requests to be discarded you need to check and adjust some runtime parameters: http_req_hdr_len, http_req_size, http_resp_hdr_len, etc.

In any case, if you are still interested in the strlen() feature, it would be trivial to add it to the std VMOD, but that support doesn't exist at the moment. You could consider using an existing VMOD including utilities like strlen() (or implement it on your own), but that's probably too much work. Finally, you could consider using a hacky approach using just VCL and a regexp:

if (req.http.Cookie ~ "^.{1024,}$") {
    ...
}

Upvotes: 2

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