Title: Facebook Conversion API Cache Problem on WordPress Last modified: May 21, 2021 --- # Facebook Conversion API Cache Problem on WordPress * Resolved [pairfumlondon](https://wordpress.org/support/users/pairfumlondon/) * (@pairfumlondon) * [5 years, 7 months ago](https://wordpress.org/support/topic/facebook-conversion-api-cache-problem-on-wordpress/) * Dear Support, * We have a caching issue with the Litespeed cache plugin and the FB Conversion API (i.e. server side events). * We have implemented the FB pixel via the WP-plugin PixelYourSite, both as a browser pixel and as a server side event (conversion API). * The issue we experience is described in this video: [https://www.youtube.com/watch?reload=9&v=YH6ve7qj1hw](https://www.youtube.com/watch?reload=9&v=YH6ve7qj1hw) * You can easily replicate the issue by loading our website per the instructions in the video above: _[ redundant link removed ]_ * How do suggest that we solve this problem where it is specifically related to the Litespeed cache plugin and de-duplicating FB events? * I look forward to your help with this issue. * Pairfum London - This topic was modified 5 years, 7 months ago by [Yui](https://wordpress.org/support/users/fierevere/). - This topic was modified 5 years ago by [Jan Dembowski](https://wordpress.org/support/users/jdembowski/). * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ffacebook-conversion-api-cache-problem-on-wordpress%2F%3Foutput_format%3Dmd&locale=en_US) to see the link]_ Viewing 11 replies - 1 through 11 (of 11 total) * Plugin Support [qtwrk](https://wordpress.org/support/users/qtwrk/) * (@qtwrk) * [5 years, 7 months ago](https://wordpress.org/support/topic/facebook-conversion-api-cache-problem-on-wordpress/#post-13471347) * Hi, * Could you please provide the report number ? * You can get it in toolbox -> report -> click “send to LiteSpeed” * Best regards, * Thread Starter [pairfumlondon](https://wordpress.org/support/users/pairfumlondon/) * (@pairfumlondon) * [5 years, 7 months ago](https://wordpress.org/support/topic/facebook-conversion-api-cache-problem-on-wordpress/#post-13472913) * Dear [@qtwrk](https://wordpress.org/support/users/qtwrk/) * Many thanks for your reply and instructions. They were very easy to follow. * Here is the report number: LiteSpeed Report Report number: ZTSMUIQC Report date: 09/30/2020 09:08:32 * I look forward to hearing back from you. * Kind regards, * Pairfum London * [serwer20](https://wordpress.org/support/users/serwer20/) * (@serwer20) * [5 years, 7 months ago](https://wordpress.org/support/topic/facebook-conversion-api-cache-problem-on-wordpress/#post-13475171) * Hi! I also need solution for this, please update this topic if You figure it out 👀 🙂 * Best! * Thread Starter [pairfumlondon](https://wordpress.org/support/users/pairfumlondon/) * (@pairfumlondon) * [5 years, 7 months ago](https://wordpress.org/support/topic/facebook-conversion-api-cache-problem-on-wordpress/#post-13475530) * Dear [@serwer20](https://wordpress.org/support/users/serwer20/) * Many thanks for lending your support to this issue. * We suspect most e-commerce website that use Litespeed and FB tracking (pixel & API) will experience this issue. * Kind regards, * Pairfum London * Thread Starter [pairfumlondon](https://wordpress.org/support/users/pairfumlondon/) * (@pairfumlondon) * [5 years, 7 months ago](https://wordpress.org/support/topic/facebook-conversion-api-cache-problem-on-wordpress/#post-13500202) * Dear [@qtwrk](https://wordpress.org/support/users/qtwrk/) * Would you have an update for us? * Or, … even better, do you already have a solution? * With kind regards, * Pairfum London * Plugin Support [qtwrk](https://wordpress.org/support/users/qtwrk/) * (@qtwrk) * [5 years, 7 months ago](https://wordpress.org/support/topic/facebook-conversion-api-cache-problem-on-wordpress/#post-13506229) * Hi, * Apologize for late response. * could you please try disable JS push and JS defer, purge all ? * Best regards, * Thread Starter [pairfumlondon](https://wordpress.org/support/users/pairfumlondon/) * (@pairfumlondon) * [5 years, 7 months ago](https://wordpress.org/support/topic/facebook-conversion-api-cache-problem-on-wordpress/#post-13507547) * Dear [@qtwrk](https://wordpress.org/support/users/qtwrk/) * Many thanks for the suggestion. * We have tried it but sadly it did not make any difference, the event ID stays the same. * As per your instructions: – we disabled JS push & defer via Litspeed Cache > Page Optimisation > JS HTTP/2 Push off & Load JS Deferred off – we then cleared the cache via Litespeed Cache > Toolbox > Empty Entire Cache – we also cleared the entire Cloudflare Cache, – last we ensured that the browser cache was clear and checked with the FB Pixel Helper in three different browsers: Chrome, Opera, New Edge (Chromium) * We found that the event ID was the same in all three browsers. * Would you like me to send you a new report number so you can investigate further? * Many thanks for your help with this problem. * Kind regards, * Pairfum London * Thread Starter [pairfumlondon](https://wordpress.org/support/users/pairfumlondon/) * (@pairfumlondon) * [5 years, 7 months ago](https://wordpress.org/support/topic/facebook-conversion-api-cache-problem-on-wordpress/#post-13508850) * Dear [@qtwrk](https://wordpress.org/support/users/qtwrk/) * Another quick update: * We switched-off the Litespeed Cache plugin and the problem was solved. * We then tried the WP-Rocket Caching plugin and with this caching plugin we did not experience the issue. * Hence, the issue is quite clearly associated with the Litespeed Cache plugin. * Kind regards, * Pairfum London * Thread Starter [pairfumlondon](https://wordpress.org/support/users/pairfumlondon/) * (@pairfumlondon) * [5 years, 7 months ago](https://wordpress.org/support/topic/facebook-conversion-api-cache-problem-on-wordpress/#post-13533463) * Dear [@qtwrk](https://wordpress.org/support/users/qtwrk/) * I was wondering whether excluding Facebook tracking from being cached might be a solution. * This is what we have in mind: [https://i.imgur.com/cbFFgrx.png](https://i.imgur.com/cbFFgrx.png) * These are the mentions of Facebook that we find on the ‘waterfall’ when we run our site through speed testing tools, e.g. Pingdome, WebPageTest.org. * Could this work? * Kind regards, * Pairfum London * Plugin Support [qtwrk](https://wordpress.org/support/users/qtwrk/) * (@qtwrk) * [5 years, 7 months ago](https://wordpress.org/support/topic/facebook-conversion-api-cache-problem-on-wordpress/#post-13535914) * Hi, * No , that is for your page’s URL * could you please try reset to default setting and see if it works ? * Best regards, * Thread Starter [pairfumlondon](https://wordpress.org/support/users/pairfumlondon/) * (@pairfumlondon) * [5 years, 7 months ago](https://wordpress.org/support/topic/facebook-conversion-api-cache-problem-on-wordpress/#post-13537334) * Dear [@qtwrk](https://wordpress.org/support/users/qtwrk/) * The author of the plugin PixelYourSite found a way to solve this issue for caching plugins like Litespeed by using Ajax. * We found that this solution works for our website. * Here is a screenshot to show this setting: * > [OnPaste.20201015-101126](https://imgur.com/ebNOwDP) * Many thanks for your help on this. * With kind regards, * Pairfum London Viewing 11 replies - 1 through 11 (of 11 total) The topic ‘Facebook Conversion API Cache Problem on WordPress’ is closed to new replies. * ![](https://ps.w.org/litespeed-cache/assets/icon-256x256.png?rev=2554181) * [LiteSpeed Cache](https://wordpress.org/plugins/litespeed-cache/) * [Frequently Asked Questions](https://wordpress.org/plugins/litespeed-cache/#faq) * [Support Threads](https://wordpress.org/support/plugin/litespeed-cache/) * [Active Topics](https://wordpress.org/support/plugin/litespeed-cache/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/litespeed-cache/unresolved/) * [Reviews](https://wordpress.org/support/plugin/litespeed-cache/reviews/) ## Tags * [api](https://wordpress.org/support/topic-tag/api/) * [browser](https://wordpress.org/support/topic-tag/browser/) * [event](https://wordpress.org/support/topic-tag/event/) * [id](https://wordpress.org/support/topic-tag/id/) * [server](https://wordpress.org/support/topic-tag/server/) * [side](https://wordpress.org/support/topic-tag/side/) * 11 replies * 3 participants * Last reply from: [pairfumlondon](https://wordpress.org/support/users/pairfumlondon/) * Last activity: [5 years, 7 months ago](https://wordpress.org/support/topic/facebook-conversion-api-cache-problem-on-wordpress/#post-13537334) * Status: resolved