Folks,
I've been trying to implement a technique posted here to restore
cookies on a cache miss.
The original question is here:
http://projects.linpro.no/pipermail/varnish-misc/2010-January/003505.html
and an interesting answer is here:
http://projects.linpro.no/pipermail/varnish-misc/2010-January/003506.html
Below is my .vcl file.
And again, here's the use case:
We have certain pages that should never be cached. The user comes in
with cookies set: "session=foo" or some such.
We strip the cookie and do a lookup.
If there's a hit, return what is in the cache.
If there's a miss, we'd like to fetch with the cookie.
Then, in fetch, pass for pages set for no-cache, and deliver for those
that are public.
It can be assumed that these pages are never hit first by non-cookied users.
But -- I am seeing a lot of requests that have no cookies on the backend.
John
Here's the VCL:
backend reviews0 {
.host = "127.0.0.1";
.port = "7000";
}
backend reviews1 {
.host = "127.0.0.1";
.port = "7001";
}
director reviews round-robin {
{ .backend = reviews0; }
{ .backend = reviews1; }
}
sub vcl_recv {
unset req.http.user-agent;
set req.backend = reviews;
if (req.request != "GET" && req.request != "HEAD") {
pass;
}
set req.http.OLD-Cookie = req.http.Cookie;
unset req.http.cookie;
lookup;
}
sub vcl_miss {
if (req.http.OLD-Cookie) {
set bereq.http.Cookie = req.http.OLD-Cookie;
unset req.http.OLD-Cookie;
}
fetch;
}
sub vcl_fetch {
unset obj.http.user-agent;
if (obj.http.Pragma ~ "no-cache" ||
obj.http.Cache-Control ~ "no-cache" ||
obj.http.Cache-Control ~ "private") {
pass;
}
if (obj.http.Cache-Control ~ "public") {
unset obj.http.Set-Cookie;
deliver;
}
pass;
}
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