DownStream Varnish Config

[Rafael El Mago]

Guys,

Varnish 4 Downstream VLC needs an update.

sub vcl_hit {
  # 5% of the time ignore that we got a cache hit and send the request to the
  # backend anyway for instrumentation.
  if (std.random(0, 100) < 5) {
    set req.http.PS-ShouldBeacon = <your-secret-key>;
    return (pass);
  }
}
sub vcl_miss {
  # Instrument 25% of cache misses.
  if (std.random(0, 100) < 25) {
    set req.http.PS-ShouldBeacon = <your-secret-key>;
    return (pass);
  }
}

The line:

set req.http.PS-ShouldBeacon = <your-secret-key>;

Should be:

set req.http.PS-ShouldBeacon = "<your-secret-key>";

Thanks

Rafael
magician

[Rafael El Mago]

Not a Header Expert but is their a reason that my Expires Header is set to 1981?

Or should I set i to "0"?

Example?

#Mark HTML as uncacheable.  If we can't send them purge requests they can't

# cache our html.

if (beresp.http.Content-Type ~ "text/html") {

     unset beresp.http.Cache-Control;

     set beresp.http.Cache-Control = "no-cache, max-age=0";

unset beresp.http.expires;

set beresp.http.expires = "0";

   }

[Joshua Marantz]

Added https://github.com/pagespeed/mod_pagespeed/issues/1284 to add the double-quotes in the doc.

RE expires header: I don't think you need that.  You are specifying cache-control.

-Josh

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[Rafael El Mago]

According to @Jeff Kaufman

By default PageSpeed serves HTML as uncacheable, with "Cache-Control:
no-cache, max-age=0".  This means Last-Modified and Expired aren't
necessary.  It needs to do this because (1) it makes browser-specific
optimizations and (2) it generally doesn't fully optimize pages on the
first try.

If you would like to cache HTML with varnish or another cache under
your control you could try the downstream caching feature:

https://groups.google.com/forum/#!topic/mod-pagespeed-discuss/RqSLL8a2hvg

So if your .html headers have Expires or Pragma Headers, you can unset them:

sub vcl_backend_response {

   if (beresp.http.Content-Type ~ "text/html") {

     unset beresp.http.Cache-Control;

     set beresp.http.Cache-Control = "no-cache, max-age=0";

     unset beresp.http.expires;

     unset beresp.http.pragma;

   }

   return (deliver);

}