Varnish bypass return(pass) with php session_id

[Christian Cantinelli]

Hi,

I have a problem with varnish 4.1.2.

I have a setup like this:

++++++++++++
[...cut...]
sub vcl_recv {
   set req.http.Host = regsub(req.http.Host, ":[0-9]+", "");
[...cut...]
        if (req.http.Host ~ "^dev.mytest.it") {
                return (pass);
        }
[...cut....]
}
sub vcl_backend_response {
        if (beresp.ttl < 120s) {
                set beresp.ttl = 120s;
                unset beresp.http.Cache-Control;
        }
        if ( (!(bereq.url ~ "(wp-(login|admin)|login)")) ||
(bereq.method == "GET") ) {
                unset beresp.http.set-cookie;
                set beresp.ttl = 1h;
        }

        if (bereq.url ~
"(?i)\.(jpe?g|png|gif|tiff|ico|pdf|swf|gz|bz2|xz|tgz|tbz|mp3|ogg|ogv|avi|flv|mp4|mpe?g|webm|woff|eot|otf|ttf|txt|html?|css|js)(\?.*)?$")
{
                unset beresp.http.set-cookie;
                set beresp.ttl = 1h;
        } else {
                set beresp.ttl = 4m;
        }
}

sub vcl_deliver {
   if (obj.hits > 0) {
     set resp.http.X-Cache = "HIT";
   } else {
     set resp.http.X-Cache = "MISS";
   }
   set resp.http.Access-Control-Allow-Origin = "*";
}

sub vcl_hit {
  if (req.method == "PURGE") {
    return(synth(200,"OK"));
  }
}

sub vcl_miss {
  if (req.method == "PURGE") {
    return(synth(404,"Not cached"));
  }
}
[...cut...]

++++++++++++

And I have a page with this content:

++++++++++++
<?php
$a = session_id();
if(empty($a)) session_start();
echo "SID: ".SID."<br>session_id(): ".session_id()."<br>COOKIE:
".$_COOKIE["PHPSESSID"];
++++++++++++

If I make a request from the web server, PHP creates a session properly
and keeps it.

If the request passes for varnish, PHP creates a session for each call
without maintaining the previous.

Inquiry for varnish, however, is marked as a MISS (so it should be
completely bypassed).

Has anyone had a problem like that?

-- 
Chris

Unix System Administrator - Network Administrator
Programmer - Webdesigner - Webmaster