Varnish + Banner Impression Problem

[Ayberk Kimsesiz]

Hi,

There is something we need to know about Varnish. Do you think the
following Wordpress settings might have a negative affect on ad impressions
(which contain Javascript)?

We suspect if there is an error in the AdServer service but with the
installation of Varnish, our impressions are incredibly diminished. Would
Varnish have an impact on this matter?

*Example of the ad code: *

<script data-adfscript="adx.adform.net/adx/?mid=220975&rnd=%%ADFRND%%"></script>
<script src="//s1.adform.net/banners/scripts/adx.js" async defer></script>

*Default.vcl*

/* SET THE HOST AND PORT OF WORDPRESS
 * *********************************************************/
vcl 4.0;
import std;

backend default {
  .host = "MY SERVER IP";
  .port = "8080";
  .connect_timeout = 600s;
  .first_byte_timeout = 600s;
  .between_bytes_timeout = 600s;
  .max_connections = 800;
    }

  # SET THE ALLOWED IP OF PURGE REQUESTS
  # ##########################################################
   acl purge {
  "localhost";
  "127.0.0.1";
    }

   #THE RECV FUNCTION
    # ##########################################################
   sub vcl_recv {
   if (req.http.Host == ".com/forum" || req.url ~ "forum") {
return (pass);
}

   # set realIP by trimming CloudFlare IP which will be used for various
checks
    set req.http.X-Actual-IP = regsub(req.http.X-Forwarded-For, "[, ].*$",
"");
unset req.http.X-Forwarded-For;
  set req.http.X-Forwarded-For = client.ip;
}

        # FORWARD THE IP OF THE REQUEST
  if (req.restarts == 0) {
    if (req.http.x-forwarded-for) {
      set req.http.X-Forwarded-For =
      req.http.X-Forwarded-For + ", " + client.ip;
    } else {
      set req.http.X-Forwarded-For = client.ip;
    }
  }

 # Purge request check sections for hash_always_miss, purge and ban
 # BLOCK IF NOT IP is not in purge acl
 # ##########################################################

  # Enable smart refreshing using hash_always_miss
    if (req.http.Cache-Control ~ "no-cache") {
    if (client.ip ~ purge || !std.ip(req.http.X-Actual-IP, "1.2.3.4") ~
purge) {
         set req.hash_always_miss = true;
    }
    }

     if (req.method == "PURGE") {
    if (!client.ip ~ purge || !std.ip(req.http.X-Actual-IP, "1.2.3.4") ~
purge) {
        return(synth(405,"Not allowed."));
        }
    return (purge);

    }
     if (req.method == "BAN") {
        # Same ACL check as above:
        if (!client.ip ~ purge || !std.ip(req.http.X-Actual-IP, "1.2.3.4")
~ purge) {
                        return(synth(403, "Not allowed."));
        }
        ban("req.http.host == " + req.http.host +
                  " && req.url == " + req.url);

        # Throw a synthetic page so the
        # request won't go to the backend.
        return(synth(200, "Ban added"));
}


  # For Testing: If you want to test with Varnish passing (not caching)
uncomment
  # return( pass );

  # FORWARD THE IP OF THE REQUEST
  if (req.restarts == 0) {
    if (req.http.x-forwarded-for) {
      set req.http.X-Forwarded-For =
      req.http.X-Forwarded-For + ", " + client.ip;
    } else {
      set req.http.X-Forwarded-For = client.ip;
    }
  }

   # DO NOT CACHE RSS FEED
   if (req.url ~ "/feed(/)?") {
    return ( pass );
   }

    ## Do not cache search results, comment these 3 lines if you do want to
cache them

    if (req.url ~ "/\?s\=") {
    return ( pass );
  }

# CLEAN UP THE ENCODING HEADER.
  # SET TO GZIP, DEFLATE, OR REMOVE ENTIRELY.  WITH VARY ACCEPT-ENCODING
  # VARNISH WILL CREATE SEPARATE CACHES FOR EACH
  # DO NOT ACCEPT-ENCODING IMAGES, ZIPPED FILES, AUDIO, ETC.
  # ##########################################################
  if (req.http.Accept-Encoding) {
    if (req.url ~ "\.(jpg|png|gif|gz|tgz|bz2|tbz|mp3|ogg)$") {
      # No point in compressing these
      unset req.http.Accept-Encoding;
    } elsif (req.http.Accept-Encoding ~ "gzip") {
      set req.http.Accept-Encoding = "gzip";
    } elsif (req.http.Accept-Encoding ~ "deflate") {
      set req.http.Accept-Encoding = "deflate";
    } else {
      # unknown algorithm
      unset req.http.Accept-Encoding;
    }
  }

  # PIPE ALL NON-STANDARD REQUESTS
  # ##########################################################
  if (req.method != "GET" &&
    req.method != "HEAD" &&
    req.method != "PUT" &&
    req.method != "POST" &&
    req.method != "TRACE" &&
    req.method != "OPTIONS" &&
    req.method != "DELETE") {
      return (pipe);
  }

  # ONLY CACHE GET AND HEAD REQUESTS
  # ##########################################################
  if (req.method != "GET" && req.method != "HEAD") {
    return (pass);
  }

  # OPTIONAL: DO NOT CACHE LOGGED IN USERS (THIS OCCURS IN FETCH TOO, EITHER
  # COMMENT OR UNCOMMENT BOTH
  # ##########################################################
  if ( req.http.cookie ~ "wordpress_logged_in" ) {
    return( pass );
  }

  # IF THE REQUEST IS NOT FOR A PREVIEW, WP-ADMIN OR WP-LOGIN
  # THEN UNSET THE COOKIES
  # ##########################################################
  if (!(req.url ~ "wp-(login|admin)")
    && !(req.url ~ "&preview=true" )
  ){
    unset req.http.cookie;
  }

  # IF BASIC AUTH IS ON THEN DO NOT CACHE
  # ##########################################################
  if (req.http.Authorization || req.http.Cookie) {
    return (pass);
  }

  # IF YOU GET HERE THEN THIS REQUEST SHOULD BE CACHED
  # ##########################################################
  return (hash);
  # This is for phpmyadmin
  if (req.http.Host == "ki1.org") {
  return (pass);
  }

  if (req.http.Host == "mysql.ki1.org") {
  return (pass);
  }

  }

# HIT FUNCTION
# ##########################################################
sub vcl_hit {
  # IF THIS IS A PURGE REQUEST THEN DO THE PURGE
  # ##########################################################
  if (req.method == "PURGE") {
    #
    # This is now handled in vcl_recv.
    #
    # purge;
    return (synth(200, "Purged."));
  }
  return (deliver);
}

# MISS FUNCTION
# ##########################################################
sub vcl_miss {
  if (req.method == "PURGE") {
    #
    # This is now handled in vcl_recv.
    #
    # purge;
    return (synth(200, "Purged."));
  }
  return (fetch);
}

# FETCH FUNCTION
# ##########################################################
sub vcl_backend_response {
  # I SET THE VARY TO ACCEPT-ENCODING, THIS OVERRIDES W3TC
  # TENDANCY TO SET VARY USER-AGENT.  YOU MAY OR MAY NOT WANT
  # TO DO THIS
  # ##########################################################
  set beresp.http.Vary = "Accept-Encoding";

  # IF NOT WP-ADMIN THEN UNSET COOKIES AND SET THE AMOUNT OF
  # TIME THIS PAGE WILL STAY CACHED (TTL)
  # ##########################################################
   if (!(bereq.url ~ "wp-(login|admin)|forum") && !bereq.http.cookie ~
"wordpress_logged_in" && !bereq.http.host == ".com/forum" ) {
    unset beresp.http.set-cookie;
    set beresp.ttl = 52w;
#    set beresp.grace =1w;
  }



  if (beresp.ttl <= 0s ||
    beresp.http.Set-Cookie ||
    beresp.http.Vary == "*") {
      set beresp.ttl = 120 s;
      # set beresp.ttl = 120s;
      set beresp.uncacheable = true;
      return (deliver);
  }

  return (deliver);
}

# DELIVER FUNCTION
# ##########################################################
sub vcl_deliver {
  # IF THIS PAGE IS ALREADY CACHED THEN RETURN A 'HIT' TEXT
  # IN THE HEADER (GREAT FOR DEBUGGING)
  # ##########################################################
  if (obj.hits > 0) {
    set resp.http.X-Cache = "HIT";
  # IF THIS IS A MISS RETURN THAT IN THE HEADER
  # ##########################################################
  } else {
    set resp.http.X-Cache = "MISS";
  }
}
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