Varnish Cache & Ad Impressions
Guillaume Quintard
guillaume at varnish-software.com
Fri Sep 2 10:23:48 CEST 2016
Try removing the headers bits and the accept-encoding parts, varnish
default behavior should be enough.
And if that doesn't help, you really need to understand what is going on on
the advertising side of things.
On Aug 31, 2016 21:42, "Ayberk Kimsesiz" <ayberk.kimsesiz at gmail.com> wrote:
> Hi Guillaume,
>
> Varnish truly has a serious affect on impressions of banners. This month
> was a substantial lost. What is your advise on this?
> We are very pleased with Varnish but also experiencing a loss of income.
>
> 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>
>
> Thanks,
> Ayberk
>
>
> 2016-08-22 14:10 GMT+03:00 Ayberk Kimsesiz <ayberk.kimsesiz at gmail.com>:
>
>> Hi,
>>
>> We are using the default.vcl file as follows. Our website is getting
>> higher traffic each day but there is a decline in ads' impression values.
>> We are using .js in ad codes. Do you think the following settings might be
>> the problem?
>>
>> /* SET THE HOST AND PORT OF WORDPRESS
>> * *********************************************************/
>> vcl 4.0;
>> import std;
>>
>> backend default {
>> .host = "********";
>> .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, "[,
>> ].*$", "");
>>
>> # 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"));
>> }
>>
>>
>> # Unset cloudflare cookies
>> # Remove has_js and CloudFlare/Google Analytics __* cookies.
>> set req.http.Cookie = regsuball(req.http.Cookie,
>> "(^|;\s*)(_[_a-z]+|has_js)=[^;]*", "");
>> # Remove a ";" prefix, if present.
>> set req.http.Cookie = regsub(req.http.Cookie, "^;\s*", "");
>>
>> # 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";
>> }
>> }
>>
>>
>> 2016-08-16 19:42 GMT+03:00 Guillaume Quintard <
>> guillaume at varnish-software.com>:
>>
>>> Maybe, what is it supposed to do, why is it there and is any of your ad
>>> frameworks affected by this?
>>>
>>
>>
>
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