Title: Doesn’t work with WP Fastest Cache plugin Last modified: January 4, 2022 --- # Doesn’t work with WP Fastest Cache plugin * [darkstudio](https://wordpress.org/support/users/darkstudio/) * (@darkstudio) * [4 years, 4 months ago](https://wordpress.org/support/topic/doesnt-work-with-wp-fastest-cache-plugin/) * Hi, when i activate WP Fastest Cache plugin, superpwa doesn’t work anymore. i have try to exclude : -superpwa-sw.js -superpwa-amp-sw.js -register-sw.js but always same issue. * Browser console: **The script does not have a MIME type. register-sw.js:5 Registration failed with SecurityError: Failed to register a ServiceWorker for scope (‘[https://mywebsite.com/’](https://mywebsite.com/’);) with script (‘[https://mywebsite.com/superpwa-sw.js&action=wpfastestcache’](https://mywebsite.com/superpwa-sw.js&action=wpfastestcache’);): The script does not have a MIME type. * note: i have replaced real url by mywebsite.com * thanks Viewing 11 replies - 1 through 11 (of 11 total) * Plugin Author [SuperPWA](https://wordpress.org/support/users/superpwa/) * (@superpwa) * [4 years, 4 months ago](https://wordpress.org/support/topic/doesnt-work-with-wp-fastest-cache-plugin/#post-15224856) * Js page is printing with Html/text header but we need javascript/text in the header. Can you please try to resolve by provide `header( “Content-Type: application/ javascript” );` * Thread Starter [darkstudio](https://wordpress.org/support/users/darkstudio/) * (@darkstudio) * [4 years, 4 months ago](https://wordpress.org/support/topic/doesnt-work-with-wp-fastest-cache-plugin/#post-15226109) * Hi, Where do you want i made this exactly ? * Thread Starter [darkstudio](https://wordpress.org/support/users/darkstudio/) * (@darkstudio) * [4 years, 4 months ago](https://wordpress.org/support/topic/doesnt-work-with-wp-fastest-cache-plugin/#post-15229203) * RE, * I dont understand your solution because i say that when WP Fatest Cache plugin is disable its work (no mime type problem) but when wp fatest cache plugin is enabled, doesn’t work anymore, is not a problem of mime type. i have checked mime type of js and mime type is correct : js = application/javascript * Do you have a solution please ? * EDIT: i have find the problem, the plugin create a file named : superpwa-sw.js& action=wpfastestcache instead superpwa-sw.js on root of website. we must rename the file to superpwa-sw.js and its works but your plugin keep the old bad name on “Service Worker” check mention on main page of your plugin configuration ( its strange). [https://ibb.co/t8FQ7gN](https://ibb.co/t8FQ7gN) - This reply was modified 4 years, 4 months ago by [darkstudio](https://wordpress.org/support/users/darkstudio/). * Thread Starter [darkstudio](https://wordpress.org/support/users/darkstudio/) * (@darkstudio) * [4 years, 2 months ago](https://wordpress.org/support/topic/doesnt-work-with-wp-fastest-cache-plugin/#post-15340946) * FYI, its not resolved. * Moderator [Yui](https://wordpress.org/support/users/fierevere/) * (@fierevere) * 永子 * [4 years, 2 months ago](https://wordpress.org/support/topic/doesnt-work-with-wp-fastest-cache-plugin/#post-15341050) * [@darkstudio](https://wordpress.org/support/users/darkstudio/) You can set resolved/ not resolved status on the sidebar * Thread Starter [darkstudio](https://wordpress.org/support/users/darkstudio/) * (@darkstudio) * [4 years ago](https://wordpress.org/support/topic/doesnt-work-with-wp-fastest-cache-plugin/#post-15584270) * Dear, after many month this issue is not yet fixed. * When wpfastestcache is used, your plugin make a strange link for service worker“ superpwa-sw.js&action=wpfastestcache” instead superpwa-sw.js and the result is that the PWA dont work and add to home screen is not showed. I have try to exclude superpwa-sw.js from wpfatestcache but your plugin continue to create a strange file on root (superpwa-sw.js&action=wpfastestcache). If we disable wpfastestcache, the superpwa generate normal file on root (superpwa-sw.js) and PWA work normaly but we need wpfastestcache plugin to improve the speed of website. [https://ibb.co/1Z8hXPk](https://ibb.co/1Z8hXPk) * Plugin Author [SuperPWA](https://wordpress.org/support/users/superpwa/) * (@superpwa) * [4 years ago](https://wordpress.org/support/topic/doesnt-work-with-wp-fastest-cache-plugin/#post-15584460) * Extremely sorry for the Inconvenience. Can you please share the URL of your website once? So that we will go through it and get back to you shortly. * Thread Starter [darkstudio](https://wordpress.org/support/users/darkstudio/) * (@darkstudio) * [4 years ago](https://wordpress.org/support/topic/doesnt-work-with-wp-fastest-cache-plugin/#post-15584935) * orp-jauche.be * Plugin Author [SuperPWA](https://wordpress.org/support/users/superpwa/) * (@superpwa) * [4 years ago](https://wordpress.org/support/topic/doesnt-work-with-wp-fastest-cache-plugin/#post-15587462) * Thanks for providing the URL. We have inspected the URL and it seems SuperPWA plugin is not installed at your end. Can you please cross check it once and confirm me once? * Thread Starter [darkstudio](https://wordpress.org/support/users/darkstudio/) * (@darkstudio) * [4 years ago](https://wordpress.org/support/topic/doesnt-work-with-wp-fastest-cache-plugin/#post-15588044) * Its normal, i have disable it because the plugin doesn’t work with wpfatestcache. * I have answer to your email support. * Plugin Author [SuperPWA](https://wordpress.org/support/users/superpwa/) * (@superpwa) * [4 years ago](https://wordpress.org/support/topic/doesnt-work-with-wp-fastest-cache-plugin/#post-15588194) * You can reach us via our site. Viewing 11 replies - 1 through 11 (of 11 total) The topic ‘Doesn’t work with WP Fastest Cache plugin’ is closed to new replies. * ![](https://ps.w.org/super-progressive-web-apps/assets/icon-128x128.png?rev=1842063) * [Super Progressive Web Apps](https://wordpress.org/plugins/super-progressive-web-apps/) * [Frequently Asked Questions](https://wordpress.org/plugins/super-progressive-web-apps/#faq) * [Support Threads](https://wordpress.org/support/plugin/super-progressive-web-apps/) * [Active Topics](https://wordpress.org/support/plugin/super-progressive-web-apps/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/super-progressive-web-apps/unresolved/) * [Reviews](https://wordpress.org/support/plugin/super-progressive-web-apps/reviews/) * 11 replies * 3 participants * Last reply from: [SuperPWA](https://wordpress.org/support/users/superpwa/) * Last activity: [4 years ago](https://wordpress.org/support/topic/doesnt-work-with-wp-fastest-cache-plugin/#post-15588194) * Status: not resolved