# W3 Total Cache — Changelog

`meteorgpl-plugin/w3-total-cache` · 101 releases, newest first, as published by the vendor.

## 2.10.7

- Feature: Minify: Cache selected external scripts locally for auto minify
- Feature: Page Cache: Add a one-pass mode for sitemap cache preload
- Enhancement: Developers: Add a generated reference of supported actions and filters
- Fix: Browser Cache: Constrain unquoted URL rewriting when removing query strings from static resources
- Fix: Page Cache: Remove the expired role-cookie compatibility path and skip caching for rejected roles
- Fix: Page Cache: Avoid Options API calls before WordPress has loaded them during early bootstrap
- Fix: Object Cache: Persist cache invalidation from wp-admin when admin object caching is disabled
- Fix: CDN: Preserve custom attachment directories when pushing media
- Fix: Google PageSpeed: Renew expired access tokens without discarding authorization
- Fix: Licensing: Show the activation-limit notice for licenses that have reached their limit
- Fix: Settings: Persist Purge via WP-Cron schedule settings
- Fix: Settings: Skip unchanged w3tc_state option writes
- Update: Remove leftover newsletter signup code
- Update: Build: Omit development-only files from the release ZIP

## 2.10.6

- Fix: Database Cluster: Restore placeholder unescape so admin searches with wildcards match
- Enhancement: Page Cache: Add w3tc_pgcache_rules_required filter to skip writing rewrite rules
- Fix: Settings: Restrict POST updates to keys owned by the active admin page
- Fix: Licensing: Limit plugin type updates to the license path
- Fix: Image Converter: Require administrator capability for convert and submit
- Fix: Config import: Validate structure before applying
- Fix: Role cookies: Stop honoring legacy names unless explicitly enabled
- Fix: Minify: Validate precache URLs before outbound fetch
- Fix: URL constants: Apply host allowlists to overrides
- Fix: Minify: Validate Java minifier JAR paths before invocation
- Update: Bunny CDN and Redis: Enable verified TLS by default
- Fix: Diagnostics: Extend log redaction across remaining formats
- Fix: Reverse proxy: Apply forwarded client IP and scheme headers only from trusted proxies
- Fix: CDN: Limit Media Library import to static assets
- Fix: CDN: Render admin server responses as text
- Fix: CDN: Use saved settings for Test
- Fix: CDN: Scope CORS headers to font resources
- Fix: Browser Cache: Normalize rewrite rule rendering
- Fix: Support: Reduce client data sent from the Support page
- Fix: Forums: Normalize API client responses
- Fix: Lazy Load: Match background styles as top-level attributes only
- Fix: Admin: Align request validation across notice, extension, setup, CDN, and minify flows

## 2.10.5

- Fix: Page Cache: Keep Disk Enhanced cache file operations within the cache directory

## 2.10.4

- Fix: Lazy Load: Match only quoted image attributes when rewriting src/srcset/sizes
- Fix: Cache purge: Restore filterable capabilities for purge-all and purge-post

## 2.10.3

- Fix: Output buffering: Skip REST API requests unless page cache REST caching is enabled
- Fix: Minify: Keep cache file operations within the cache directory
- Fix: Defer Scripts: Restore timeout configuration placeholder replacement

## 2.10.2

- Fix: Disk cache: Restore file-locking writes on PHP 8+
- Fix: Apache: Limit Options -MultiViews in page cache rules to compatibility mode
- Fix: Page Cache: Skip storing redirect responses

## 2.10.1

- Fix: General Settings: "The link you followed has expired" when emptying all caches
- Fix: Redis/Memcached/CDN: Restore connection handling after 2.10.0 at-rest credential encryption
- Fix: At-rest credentials: Defer encryption until WordPress salts are available
- Fix: Always Cached: Queue regeneration on nginx with Disk: Enhanced page cache
- Fix: mfunc: Render unrecognized dynamic-fragment tags as empty output
- Fix: Apache: Remove Options -MultiViews from root .htaccess (HTTP 500 on restrictive AllowOverride)
- Fix: Multisite: Admin page links in network admin

## 2.10.0

- Security: Hardened authorization, capability, and request-verification (nonce/CSRF) checks across admin and AJAX endpoints
- Security: Improved input validation and output escaping to prevent cross-site scripting (XSS)
- Security: Strengthened protections against code, command, and file-inclusion injection
- Security: Hardened processing of dynamic and cached content, including data serialization
- Security: Restricted outbound server-side requests to mitigate server-side request forgery (SSRF)
- Security: Restricted configuration changes to prevent unauthorized modification
- Security: Improved handling of stored credentials, cookies, and generated server-configuration files
- Security: Reduced potential information disclosure and improved security logging

## 2.9.4

- Fix: Output buffering: Reverted to previous output buffering from 2.9.1
- Fix: Cloudflare: Token/Key validation
- Fix: Prevent mfunc processing bypss by user-agent

## 2.9.3

- Fix: Output buffering: Discard nested OB contents for non-HTML responses (JSON/AJAX) to prevent HTML prepended to JSON output
- Fix: Output buffering: Add wp_die_ajax_handler and wp_die_json_handler filters to properly handle AJAX die paths
- Fix: Page cache: REST API responses no longer cached due to output buffering pipeline being skipped for non-HTML responses
- Fix: Lazy load: Add debounced MutationObserver so images injected by AJAX plugins (e.g. FacetWP) are processed without requiring per-plugin integration; also fix async_head embed method not updating window.w3tc_lazyload to the live LazyLoad instance after initialization

## 2.9.2

- Fix: Patch broken access control for Image Service AJAX operations
- Fix: mfunc dynamic output buffering fatal error causing blank pages
- Fix: Patch mfunc security vulnerability

## 2.9.1

- Fix: Image Converter: Reset request when status is 404
- Fix: Image Converter: Better handling of separate format requests
- Fix: Image Converter: UI/JS changes
- Fix: Config caching/saving issue

## 2.9.0

- Feature: Next-Gen AVIF image conversion (Pro)
- Feature: Added notices for some billing issues
- Fix: Bunny CDN purge section
- Fix: New Relic API
- Fix: Nginx + Memcached Unix socket compatability
- Update: Setup Guide Wizard and test improvements
- Update: WebP Converter renamed to Image Converter

## 2.8.15

- Fix: Elementor: Carousel lazy load
- Fix: Elementor: Cache clearing issues
- Fix: Strip all mfunc/mclude tags from REST, feeds, and comments
- Fix: Better validation for file directory cleanup
- Fix: Bunny CDN: Settings page purge URL section
- Fix: Minify: Auto JS: Handle async and defer attributes with values
- Fix: Google PageSpeed: Lighthouse changes
- Fix: Cloudflare: Undefined array warning
- Fix: Rackspace API: Reponse code handling
- Fix: License deactivation messages
- Update: ChartJS updated to v4.4.1
- Enhancement: Added support links

## 2.8.14

- Fix: Better logic for mfunc/mclude processing
- Enhancement: More consistent purge notices

## 2.8.13

- Fix: Sanitize mfunc/mclude content in REST calls
- Fix: Resolved plugin check errors
- Fix: Discard simplexml errors
- Fix: Missing text domains
- Fix: Ensure array type for filter "w3tc_footer_comment"
- Enhancement: Image Converter: WP_Query optimizations

## 2.8.12

- Fix: Lazy load background-image style handing
- Fix: Elementor: Also flush Object Cache after Page Cache is flushed
- Fix: Canonicalize Cache read path to avoid variants

## 2.8.11

- Fix: Avoid redundant object cache misses in WP 6.4 - 6.7
- Fix: Admin bar: Do not show "Purge All Caches Except Cloudflare" if disabled after it was configured
- Fix: Error handling for URL downloads
- Fix: Menu items for non-administrators
- Update: Lazy load library: 12.2.0 => 19.1.2
- Enhancement: Use SimpleXMLElement to parse sitemaps and RSS feeds
- Enhancement: Flush Elementor cache when all caches are flushed

## 2.8.10

- Fix: Exception handling on activation
- Fix: wp_resource_hint handling for arrays
- Enhancement: Added X-W3TC-CDN header

## 2.8.9

- Fix: AWS S3 test
- Fix: Gravity Forms submissions
- Fix: Windows: Configuration import
- Fix: Redis: Fix PHP 8 warning for incrBy value not being an integer
- Fix: DbCache Cluster: Check for mysqli_result before using the object
- Fix: PHP 8 warnings
- Fix: Typos on settings pages

## 2.8.8

- Fix: Usage Statistics JavaScript error
- Fix: Regex matching for Cookie Cache Groups
- Fix: Image Service: Error when get_current_screen() is run before admin_init
- Fix: _load_textdomain_just_in_time timing issue for WP-CLI and the Setup Guide
- Fix: "DOMDocument::loadHTML(): ID  already defined in Entity" errors
- Fix: Cloudflare: Saving settings with a value of 0
- Update: Removed StackPath, Limelight, and Highwinds CDNs due to end of service

## 2.8.7

- Fix: Exit survey email field submission
- Fix: Setup Guide analytics
- Update: Allow deleting plugin data when skipping the exit survey on deactivation
- Update: aws/aws-php-sns-message-validator (1.9.0 => 1.9.1)

## 2.8.6

- Fix: Error deactivating when selected to delete plugin data
- Fix: WP-CLI: Enable Object Cache depending on settings
- Fix: Delete all plugin WordPress Options if selected on deactivation
- Enhancement: Automatically disable Object Cache after plugin update if set to Disk and display a notice
- Enhancement: WP-CLI: Added settings to enable Object and DB Cache for WP-CLI
- Enhancement: Added an email field to the exit survey for requesting help
- Enhancement: Added a popup modal to accept the risk when enabling Object Cache using Disk

## 2.8.5

- Fix: CDN: Amazon S3 long hostname for default region
- Fix: WP-CLI: Error running "wp w3tc alwayscached_*" commands
- Fix: WP-CLI: Remove HTML in output
- Enhancement: Simplified license messaging

## 2.8.4

- Fix: Deactivation modal JS error

## 2.8.3

- Fix: HTTP API calls for checking required files
- Fix: script-src-elem and style-src-attr security headers
- Fix: Handle multiple line srcset attributes for CDN URL replacement
- Fix: Fragment Cache: Fixed logic for navigation links
- Fix: Check for modified advanced-cache.php dropin/addin file
- Fix: Log directory name is made unique
- Enhancement: Added an exit survey with option to delete plugin data on deactivation
- Enhancement: Fragment Cache: Added notices for configuration
- Enhancement: Use admin-ajax for settings help tab content links
- Update: Handle XML MIME types in cache by default
- Update: Added "immutable" options for cache-control headers
- Update: Added WP-CLI command descriptions
- Update: CDN widget notices for BunnyCDN
- Update: Image Converter widget notice

## 2.8.2

- Fix: Added additional user capability checks
- Fix: Ensure Object Cache garbage collection (disk) WP Cron event is scheduled
- Fix: Added additional checks when loading the Object Cache dropin
- Fix: Disable Database, Object, and Fragment Cache when using WP-CLI
- Fix: Object Cache debug logging
- Fix: FAQ help tabs
- Update: Coding standards

## 2.8.1

- Fix: Ensure WP Cron events get scheduled when using the Setup Guide wizard and on upgrade
- Fix: Undefined variable when the Object Cache purge debug log is enabled
- Update: Added warnings in the Setup Guide and the General Settings page when using Disk for Database and Object Caches
- Update: Skip Database and Object caches when using WP-CLI

## 2.8.0

- Feature: Always Cached extension
- Feature: Purge caches on WP-Cron schedules
- Fix: Cloudflare: Some settings were not saved correctly
- Fix: Check and update file mode/permissions for cache files
- Fix: Issue prompting for credentials for some non-direct filesystem types
- Enhancement: Added an admin notice if WP-Cron is not functioning correctly
- Enhancement: Added Browser Cache filters
- Update: Upgraded JSMin library to 2.4.3
- Update: Added Premium Services tabs

## 2.7.7

- Update: CDN: Added support for Microsoft Azure EntraID Managed identities

## 2.7.6

- Fix: Improved cache flushing on actions/updates
- Fix: Google PageSpeed authorization
- Fix: Remove Fragment Cache link if extension is disabled
- Fix: License status fix
- Fix: Statistics PHP warning when some data is stale
- Fix: API improvement for non-200 responses
- Enhancement: Added notices when choosing Disk for object and database cache engines
- Update: Object cache improvements
- Update: Allow WPML extension activation for TranslatePress
- Update: Added more information for selections in the setup guide wizard
- Update: Updated cache header directive choices (no-cache/no-store)
- Update: Nginx configuration examples

## 2.7.5

- Feature: Added dismissible notifications
- Fix: PHP error in Page Cache when deleting media
- Fix: PHP warning in Page Cache when modifying an attachment
- Update: Added additional default query strings for page cache exemptions
- Update: Removed obsolete Google PageSpeed metrics
- Update: Condensed Google PageSpeed proof block format for certain settings/features
- Update: Added missing Google PageSpeed score block for PageCache Lazy Loading Google Maps setting on General Settings page

## 2.7.4

- Fix: WP-CLI get option output for array type
- Fix: Remove CSS/JS URL matching
- Fix: Nginx rules for feature and permission policies
- Fix: Redis connect port for unix sockets error
- Update: Newsletter in footer is now a link to a working form
- Update: Added JSON type for WP-CLI get/set option
- Update: Added config export for WP-CLI
- Update: Added content matching option for Remove CSS/JS individual entries
- Update: Updated Google PageSpeed score block appearance for cleaner UI
- Update: Added Google PageSpeed score block for PageCache Lazy Loading Google Maps setting
- Update: Added Google PageSpeed score block for Minify Eliminate Render Blocking CSS option

## 2.7.3

- Fix: Page Cache: File Cleaner now uses the correct expiration setting
- Fix: PHP 8.1 warnings for Redis connect
- Fix: Google ChartJS error
- Update: Bumped PHP minimum version to 7.2.5; added support for up to PHP 8.3
- Update: AWS SDK PHP dependency updated to 3.314.2
- Update: Microsoft Azure Storage SDK PHP dependency updated to 1.5.4 (blob) and 1.5.2 (common)
- Update: Several other PHP and NodeJS dependencies updated
- Update: Made improvements to the Remove CSS/JS feature
- Update: Removed the newsletter sign-up popup and added it in the footer
- Update: Added use-case proof and links to settings pages
- Update: Changed CDN default to none and updated the StackPath EOL notice

## 2.7.2

- Fix: Page Cache cleanup purging all if browsercache.html.lifetime > W3TC_CACHE_FILE_EXPIRE_MAX
- Fix: Page Cache primer: Ignore sitemap XML comments
- Fix: Page Cache primer: Preload cache for custom post types
- Fix: Page Cache primer: Add an option to prime cache after updating a post/page/CPT
- Fix: Redis test logic
- Fix: Cloudflare extension: Setting values via API
- Fix: Amazon SNS message validation
- Fix: Handle XML setting being saved properly
- Update: Add more options to the Remove CSS/JS feature
- Update: Add an option for Amazon CloudFront default region in distribution hostname
- Update: Add information about feature impact on PageSpeed
- Update: Reworked the Page Cache Preload settings UI

## 2.7.1

- Fix: Page Cache: Prefer Brotli over Gzip
- Fix: Page Cache: Purge sitemaps on post creation/edit/trash/delete
- Fix: Page Cache: Processed content filter
- Fix: Minify URL to filename filter mapping
- Update: Added Bunny CDN partner information
- Update: Added filters for Apache rules and Page Cache postfix

## 2.7.0

- Feature: Performance Dashboard update
- Feature: Remove unused CSS/JS
- Fix: Nginx feature and permission policy header syntax
- Fix: Memcache install check
- Fix: CloudFront purge button
- Fix: Uncaught type error on the install page
- Fix: Page mapping data
- Fix: Add missing id for a save settings button
- Fix: Extension counts
- Fix: PHP 8.2 deprecation warnings for dynamic class property assignments
- Fix: Do not autoload WP option for PageSpeed data
- Fix: Cache groups: Fix spacing in values for htaccess syntax
- Fix: Refactor Minify cache key mapping to have shorter keys and separate storage
- Fix: Minify statistics output and PHP warnings
- Fix: Feature Showcase: New feature version numbers
- Fix: Lazy Loading URL pattern match
- Update: Upgrade modal/popup
- Update: Added "Learn more" links

## 2.6.1

- Fix: Image Converter extension activation
- Fix: Media Library upload may fail when using Bunny CDN
- Fix: Cloudflare API error when updating certain settings
- Fix: Lazy Loading issue with the Delay Scripts feature enabled
- Update: Allow custom hostname changes for Bunny CDN

## 2.6.0

- Feature: Added support for Bunny.Net CDN
- Feature: Preload requests (Pro)
- Fix: Error when changing CDN cookie domain setting
- Fix: Admin notice when flushing cache from the admin bar
- Fix: Error in some Minify cache file operations
- Fix: PHP 8 compatibility
- Update: Delay scripts UI changes

## 2.5.0

- Feature: Added Delay Scripts (Pro)
- Fix: Several PHP 8 warnings
- Fix: Fragment Cache extension PHP warnings when no engine was selected
- Fix: Fragment Cache engine selection disabled for pro license under certain conditions
- Fix: Added Database Cluster compatibility for older db.php files
- Fix: Fixed one PageSpeed tool metric not outputting data and adjusted a few labels
- Fix: Multiple anchor links for PageSpeed block on General Settings page
- Fix: Cache Groups validation on save
- Fix: Cache Groups delete button not working for added groups
- Update: Renamed Image Service feature to Image Converter
- Update: Added Image Converter block to General Settings page along with link to navigation bar
- Update: StackPath CDN prices (Service ending November 22, 2023 and will be replaced by Bunny CDN in future update)

## 2.4.1

- Fix: Add a fallback for the older version of wp-content/db.php

## 2.4.0

- Feature: Added filter "w3tc_config_item_objectcache.enabled" to allow for disabling W3TC object cache
- Fix: Auto-apply W3TC Pro license after purchase via in-plugin purchase/upgrade buttons
- Fix: PHP 8 warnings for Page and Fragment caches
- Fix: Replaced delete_blog deprecated hook with wp_uninitialize_site and wp_update_site
- Fix: Database Cluster configuration file save issue
- Fix: Fragment cache will now be disabled for non-pro users instead of being only disabled on the front-end
- Fix: Premium services widget list is now synced with the support page
- Update: User interface updated for cleaner appearance and easier navigation and control
- Update: Added support for get/set/add/delete wp_xxx_multiple methods to Object cache

## 2.3.3

- Fix: Fragment Cache: Fatal error when displaying registered groups
- Fix: PHP 8 deprecation warnings in the SNS Message Bus and NuSOAP libraries
- Fix: Broken nonce for renewal form
- Fix: Page Cache: Moved hardcoded query string exemptions to the settings page
- Update: Redis and Memcached host/IP/domain configuration examples

## 2.3.2

- Fix: Correct interpolation of a symlinked cache directory
- Fix: Memcached test using SASL authentication
- Fix: Multi-site authorization request returning to incorrect URL

## 2.3.1

- Fix: PHP 8 compatibility: Invalid return type if Browser Cache is disabled
- Fix: Added AWS SNS message classes (aws/aws-php-sns-message-validator)
- Fix: PageSpeed service: messages and escaping
- Fix: Image Service meta query handling
- Update: Dependency version updates
- Update: Content-Security-Policy (CSP) and Content-Security-Policy-Report-Only (CSPRO) header field configuration

## 2.3.0

- Feature: PageSpeed Insights reports and performance page widget
- Feature: Added basic OpenLiteSpeed support
- Feature: Add Permissions-Policy to mirror Feature-Policy directives
- Fix: PHP 8.2 compatibility
- Fix: GuzzleHttp 7 conflict with Azure
- Fix: Allow object cache updates when using WP-CLI
- Fix: Added missing Page Cache configuration "host" value
- Fix: Missing on_comment_status action callback
- Fix: Flush cache on attachment update
- Fix: Varnish flush for posts
- Update: Improved comment status logic for flushing database and object caches
- Update: Adjusted FTP form style
- Update: Removed deprecated MaxCDN and NetDNA components and added a notice if one was used
- Update: Removed deprecated FeedBurner

## 2.2.12

- Fix: Comment status change error
- Fix: Varnish flush post arguments

## 2.2.11

- Fix: Error when flushing page cache after an attachment update

## 2.2.10

- Fix: Optimized and fixed object cache flushing
- Fix: Scheduled post page cache flushing
- Fix: Admin bar flush cache for current page with disabled purge policy
- Fix: Loop when disabling Minify HTTP/2 push setting
- Fix: Extension admin notice missing links
- Update: Removed custom translation files

## 2.2.9

- Fix: Reset our textdomain for translations

## 2.2.8

- Fix: Escape output in compatibility checker, minify, and New Relic pages
- Fix: Admin notice buttons on non-plugin pages
- Fix: Namespace on exception type in a minify class
- Fix: Translation issues due to hooks and typos
- Fix: Broken JavaScript in admin_print_scripts calls when language is not English
- Fix: Deprecated warnings in JS and CSS minify
- Update: Translation files

## 2.2.7

- Fix: Updated database cache connection class to avoid deprecated warnings in WordPress 6.1
- Fix: Redis: Fixed handling of retry interval and timeout options for usage statistics
- Enhancement: Redis: Added TLS/SSL certificate verification option
- Enhancement: Page cache: Added query string exemptions

## 2.2.6

- Fix: Error clearing all cache when using CloudFront full CDN in Pro

## 2.2.5

- Fix: Revert WooCommerce Variation Image Gallery plugin CDN filter
- Fix: DB cache syntax error in PHP 5.6
- Fix: Added missing space to S3 CDN bucket label
- Fix: JS error for CloudFront CDN related check on non-W3TC pages
- Fix: Page cache unpack warning for empty/malformed files
- Enhancement: Image Service pre_get_posts anonymous action now hooked (w3tc_modify_query_obj)
- Enhancement: Image Service ajax_query_attachments_args anonymous action now hooked (w3tc_filter_ajax_args)

## 2.2.4

- Fix: Extensions URL in settings
- Fix: Redis undefined array key warnings
- Fix: Redis connect issue based on phpredis version
- Fix: Sanitization of licensing messages
- Fix: DB cache error in Ajax
- Fix: Call to undefined function in DB cache query class
- Fix: PHP 8 compatibility: join
- Fix: WooCommerce Variation Image Gallery plugin CDN filter
- Enhancement: Add setting for AWS S3 public objects in ACL
- Enhancement: Check if post is empty before cache flush
- Enhancement: Add max lifetime setting for non-disk page cache
- Enhancement: Add notice when selecting CDN using CloudFront
- Update: CSS Tidy 1.7.3 => 2.0.1
- Update: Add sns-message-validator
- Security: Ensure cache writes in cache folders

## 2.2.3

- Fix: Redis Cache: Removed exception on warnings
- Fix: Compatibility check for WP_CACHE
- Fix: Flush all cache cache except Cloudflare button
- Fix: License terms update notice escaping
- Fix: Feature Showcase: Image Service activate button
- Security: Updated guzzlehttp/guzzle to 6.5.8

## 2.2.2

- Security: PHPCS and WPCS updates
- Security: Updated guzzlehttp/guzzle to 6.5.6
- Security: Updated guzzlehttp/psr7 to 1.8.5
- Fix: Cloudflare flush all cache
- Fix: Access log test
- Fix: Better handling for PHP 5.6
- Fix: Convert Redis warnings to exceptions
- Fix: WordPress 5.5 image lazy loading
- Fix: Infinite loop when using database cluster configuration
- Fix: Database cluster logic
- Fix: FTP credentials form
- Fix: Preview deploy button
- Fix: Image Service links in multisite network admin
- Fix: Enable Image Service settings changes in multisite blog/sub sites
- Enhancement: Updated Cloudflare settings to allow a global API key or token
- Enhancement: Added Cloudflare CDN public objects option to settings
- Enhancement: Added timeout settings for Redis
- Enhancement: Added TLS/SSL certificate verification option for Redis
- Enhancement: Added Image Service visibility option
- Enhancement: Updated Image Service limit notification
- Enhancement: Better handling of trailing slash URLs
- Update: Adjusted lightbox for accessibility
- Update: Removed deprecated opcache flush

## 2.2.1

- Fix: Cloudflare: Removed use of the retired ip_lkup V1 endpoint
- Fix: Prevent error in some environments using non-direct filesystems
- Fix: Added better checking for some filesystem actions
- Fix: AWS CloudFront: Reverted async change for cache invalidation to honor promises
- Enhancement: Added option to exclude minified JS files from being processed by Rocket Loader
- Enhancement: Improved handling of Image Service rate-limiting and error messages

## 2.2.0

- Feature: Image Service extension: WebP conversion options

## 2.1.9

- Fix: Cloudflare Dashboard Widget: Updated to use GraphQL
- Fix: Cloudflare Dashboard Widget: Use WordPress timezone
- Fix: CDN: Execute purge only if hosting is enabled, to prevent unneeded delays
- Fix: Published/modified custom posts not clearing the archive cache(s)
- Fix: Native WordPress sitemap caching
- Fix: Extra MIME groups other than controlled by settings were added to rules
- Fix: Usage Statistics: Not functioning when object cache is set to Redis
- Fix: AMP Extension: Prevent popup admin bar for endpoints
- Fix: Setup Guide Wizard: CSS for long translations
- Fix: Opcache Settings: Validate timestamp indicator checkbox
- Update: Remove robots.txt cache toggle setting
- Enhancement: Impove 404 detection
- Enhancement: Improved compatibility check indicators
- Enhancement: AWS CloudFront: Faster cache invalidation using async

## 2.1.8

- Fix: Corrected handling of robots.txt (file and filter)

## 2.1.7

- Fix: Corrected relative paths used in the JS minify YUI Compressor
- Fix: Disallow crawling of cache directory
- Fix: Responsive display for the dashboard
- Enhancement: Added lazy load threshold setting
- Enhancement: Added feature policy security headers to settings

## 2.1.6

- Fix: JS minify issue with template literal backticks
- Fix: Do not redirect when using WP-CLI
- Fix: Missing whitespace in Memcached Nginx configuration
- Fix: Setting for CDN over passive FTP
- Fix: Updated CDN Minify regex
- Fix: Added missing text domains and fixed translations
- Enhancement: Allow default AWS credentials provider
- Enhancement: Added error logging when minification base URL is not found

## 2.1.5

- Fix: Sanitize extension argument

## 2.1.4

- Fix: Use Memcached server from config for Nginx rules instead of localhost
- Fix: Allow more characters in CDN hostname sanitization
- Fix: Added missing textdomains for Browser Cache settings
- Fix: Avoid a possible PHP warning in LazyLoad mutator
- Enhancement: Added a filter w3tc_cdn_cf_flush_all_uris for CloudFront purging

## 2.1.3

- Fix: Authenticated Persistent XSS & XFS in CDN admin page
- Update: AWS library version 3.183.0
- Update: Minify: Include theme template files using page_* filenames

## 2.1.2

- Fix: Skip removing spaces around "" tags in HTML Minify
- Fix: Updated admin URL logic for multisite installations
- Fix: TransparentCDN purge URL validation
- Fix: Added an option to use ABSPATH as the document root for Minify
- Fix: Database cache debug message
- Update: Added regions for AWS S3 (af-south-1, cn-north-1, cn-northwest-1, eu-south-1)
- Update: Added MIME types AVIF and AVIFS for Browser Cache rules
- Update: Enhanced "get_pagenum_link" filter
- Update: Removed "comment" from the non-persistent object cache group

## 2.1.1

- Fix: Move Minify library to a namespace to avoid conflicts with other plugins
- Fix: Check for AWS before loading functions
- Fix: Update Minify ClosureCompiler base URL; use HTTPS
- Fix: Corrected getting the network siteurl
- Fix: Prevent PHP warning in CurlFactory
- Update: Added information links to general minify options
- Update: Added video/ogg support for browser caching

## 2.1.0

- Feature: Added a Feature Showcase to highlight new and existing features
- Update: Consolidated cache groups settings pages
- Update: Replaced deprecated jQuery method for WordPress 5.6
- Fix: PHP warnings for sprintf placeholders in PHP 8
- Fix: PHP deprecated warnings in PHP 8
- Fix: Browser Cache Quick Reference Chart link
- Fix: Bad nonce in help
- Fix: Google Drive CDN JavaScript

## 2.0.1

- Fix: Corrected redirection logic for the new Setup Guide
- Fix: Fixed JavaScript w3tc_ga error

## 2.0.0

- Feature: Added the Setup Guide wizard for onboarding
- Update: Updated jQuery compatibility and methods deprecated in WordPress 5.6
- Fix: Browser Cache: Fixed ExpiresByType code; changed from modified time to client access time

## 0.15.2

- Fix: Minify: Do not remove quotes around meta tags
- Fix: Minify: Removal of spaces in calc function was breaking CSS
- Fix: Browser Cache: Query string was not added to prevent caching after setting changes
- Fix: Avoid warning when sending an empty URL for purging
- Update: Added a filter for minified JavaScript content
- Update: Minify: Added options for minify only got both JS and CSS in auto mode

## 0.15.1

- Fix: Fixed Memcached flush logic
- Fix: Remove disk enhanced rewrites when disabling page cache
- Fix: Better handle conflicts on activation

## 0.15.0

- Feature: Added TransparentCDN full-site delivery option
- Fix: Update settings on activation in a changed environment
- Fix: Fixed a compatibility check for Apache when PHP is running as CGI
- Fix: Always set HSTS headers in Apache; not only for 2xx HTTP codes
- Fix: Implemented anatomic incrementing of key version in Memcache(d)
- Update: Allow filtering of w3tc_minify_url_for_files Minify URL for files

## 0.14.4

- Fix: Cleanup widget and postbox display for WordPress 5.5
- Fix: Update to PageSpeed API v5, show webvitals metrics
- Fix: Console error when adminbar is hidden and PageSpeed module is active
- Fix: Stats view JS issue
- Fix: Deprecated jQuery warnings
- Fix: Require files for request_filesystem_credentials() call
- Added option to disable jquery-migrate on the front-end. Fixed #172 master (#240)

## 0.14.3

- Fix: Take "Accepted Query Strings" into account when "Cache query strings" enabled
- Fixed typo in variable for lazy loading
- Update: Add lazy load Google Maps reference to the general settings page
- Update: Support background-image: together with background: for lazy loading

## 0.14.2

- Fixed WP-CLI redirect issue in multisite
- Fix: Avoid PREG_JIT_STACKLIMIT_ERROR in minify
- Fix: Prevent empty needle PHP warning
- Update: Allow to specify URIs with a query string in Additional Pages

## 0.14.1

- Fixed CSS minify URL rewrite logic that affected some lazy loading and CSS URL addresses using protocols

## 0.14.0

- Added lazy loading for Google Maps
- Added a filter w3tc_minify_css_content for minified contents
- Fixed a minify regex issue in non-Unicode websites
- Fixed a PHP notice in WPMU: accessing array offset on null
- Fixed a minify issue where embedded CSS URL fragments were converted incorrectly
- i18n improvement
- Changed default to disabled for wp-admin requests in the object cache

## 0.13.3

- Fixed HTML minification of img elements containing embedded SVG strings
- Removed an identifying value for GDPR

## 0.13.2

- Fix: Don't store content of HEAD requests
- Updated informational URL on page cache static page comments

## 0.13.1

- Fixed php warnings in PgCache_ContentGrabber.php

## 0.13.0

- Added new Pro feature, Debug - Purge Stack Trace
- Added "Feature Policy" security header
- Removed deprecated get_magic_quotes_gpc()
- Improved AMP Extension by ignoring value of amp querystring marker in request if passed without value in config
- Improved lazyload by not processing elements with skip-lazy class or data-skip-lazy attribute
- Fixed caching of query-string normalization redirects, no longer cached when cache key is normalized by accept querystring arguments, caused redirect loop

## 0.12.0

- Added querystring based URL structures for AMP pages
- Added filter of minify options
- Added lazyload picture tag support
- Removed footer link "Support Us" option
- Improved wp_die handling
- Improved lazyload handling of content in script tags
- Improved lazyload handling of feeds
- Improved printing tags coming from feeds
- Improved handling of modified posts before wp_rewrite initialized
- Nginx rules changed a lot to avoid "location" block conflicts. That change may cause problems on some systems using non-default WordPress rules - keep a backup of your original rules
- Improved handling of .htaccess files in regard to EOF
- Fixed Varnish purging
- Fixed html minification of data tags equaling 0

## 0.11.0

- Added recommendation for BoldGrid's Total Upkeep plugin
- Added new lazy loading feature
- Removed New Relic extension by default for new installations
- Updated usage of html minification and quote removal
- Improved memcached config and added optional binary protocol setting
- Improved process of renewing expired licenses
- Improved page cache purging
- Improved FAQ link by opening in new window
- Improved detection of detect_post_id
- Improved REST caching in relation to cache headers like X-WP-*
- Improved Vary User-Agent header usage
- Improved various features with AMP pages and HTTP2
- Improved redis connection string to allow for tls://host:port format
- Fixed file headers for CloudFront S3 CDN
- Fixed fatal error on with flush / SNS
- Fixed comments with URLs within minify debug mode
- Fixed ObjectCache statistics within footer
- Fixed temporary hotfix with wp_die and regular output
- Fixed fragment cache header link
- Fixed flushing of /feed and /feed/ cache
- Fixed js error in widget
- Fixed fatal cache flush error caused by empty $wp_rewrite
- Fixed path for file_generic REST caching on non-default port
- Fixed test minify button with Closure Compiler engine

## 0.10.2

- Fixed compatibility with wpdb::prepare in WordPress 5.3

## 0.10.1

- Fixed slowdown in memcached engine
- Fixed Purge Cache menu links so they flush current blog in WPMU
- Fixed error during upgrade, "Call to undefined method W3TC\Util_Content::is_database_error"
- Updated Redis cache engine to avoid "Function Redis::delete() is deprecated" warning

## 0.10.0

- Improved Statistics component for pro users
- Improved support for CloudFront distributions with multiple origins
- Improved redirects by using safer wp_safe redirect
- Improved .htaccess usage when pagecache does not require it
- Improved protection of unexpected values in global variables
- Added more Amazon S3 regions
- Added support for memcached binary protocol when available
- Added caching for WebP MIME type
- Updated S3 bucket creation by settings CORS policy
- Updated blogmap to allow urls with custom ports
- Fixed usage of base url with minify
- Fixed mixing content of sync & async scripts with minify

- Fixed S3 + CloudFront urls when CNAMEs not used

## 0.9.7.5

- Updated AWS library
- Added support of set_sql_mode by dbcluster
- Improved support for webserver running on non-default port with disk-enhanced
- Improved menu icons
- Fixed php warning when remote service cannot be loaded
- Fixed php warnings on support page

## 0.9.7.4

- Fixed PHP warning when Redis integration not configured correctly
- Fixed 404 in multisite caused by subdirectory issue
- Fixed object cache issue in multisite where object cache was cleared at wrong time
- Fixed database cluster in WordPress 5.1
- Fixed warning caused by user agent theme change used
- Fixed minification in multisite when URLs were set to root-blog based url
- Fixed undefined w3tc_ga issue
- Improved purging of current page by using post_id instead of URL
- Improved cache delivery of /feed URLs
- Improved security on calls to opcache flush
- Improved minification of files in environments running on non-default ports

## 0.9.7.3

- Fixed caching of redirect responses based on empty response body
- Improved compatibility with WordPress 5.1
- Improved transports, unix: prefix not required
- Improved minify html

## 0.9.7.2

- Fixed fatal error during media file upload with CDN module active
- Fixed removal of empty values, JSON encoded string in attribute, trailing quote at end of tag, and the handling of anchors in HTML minify
- Fixed undefined index warning
- Fixed fatal error when purging CDN using full site delivery

## 0.9.7.1

- Fixed undefined variable notice
- Fixed "No such file or directory" warning
- Fixed writing to PHP error log rather than WordPress debug log
- Fixed default referrer policy should be "no-referrer-when-downgrade"
- Fixed php_flag error related to browser cache, using ini_set instead
- Fixed Cloudflare IPv6 check undefined offset
- Fixed Undefined constant WP_ROOT
- Fixed frame-ancestors being overwritten by frame-src
- Fixed missing semicolon in nginx configuration
- Fixed HTTP/2 URLs handling for browser cache and CDN modules
- Fixed display of CDN debug information
- Fixed CSS Minification with Google Fonts when included via "Include external files/libraries" and non-latin character-sets are loaded
- Fixed media query string not updating when all caches were purged
- Fixed double slash with ABSPATH if file exists
- Fixed setting max-age and expires header simultaneously
- Fixed SASL detection for PECL Memcached
- Fixed handling of manually entered objects to be purged on CDN
- Fixed query string handling in Nginx
- Improved error handling with Cloudfront
- Improved page cache logging
- Improved multi-tenant support for memory-based caching engines
- Improved CSS minification
- Improved purge behavior for changed media objects when using CDN
- Improved compatibility with sitemap plugins
- Added support for Memcached for Nginx
- Added support for caching webm files
- Added Brotli HTTP compression support
- Added StackPath full site delivery support
- Added _wc_session_ to the list of ignored query stems for improved WooCommerce compatibility

## 0.9.7

- Fixed minified files not being hosted by CDN when enabled if "host minified files" is disabled
- Fixed warning thrown when purge all was selected (via nigrosimone)
- Fixed undefined offset error in fragment cache
- Fixed MaxCDN test button failure when debug mode is enabled
- Fixed purging of feeds when cache feeds option is enabled
- Improved handling of errors when full site delivery isn't set
- Improved nginx.conf to support xml caching
- Improved nginx.conf to support HSTS for static files
- Improved minify's handling of query strings
- Improved database caching, frequent wp_options no longer flush posts or comments data
- Improved Limelight Networks CDN integration
- Improved FAQ, they're now hosted in the GitHub public repository
- Improved handling for /*

## 0.9.6

- Fixed anonymous usage tracking, default to disabled
- Fixed incorrect minify cache data written if target directory missing
- Fixed empty minify cache file written when file locking enabled
- Fixed missing commas in CSS (via nigrosimone)
- Fixed typo in object cache engine (via Furniel)
- Fixed incorrect reuse of redis connections when persistent connections option enabled
- Fixed reliability of Google Drive (via jikamens)
- Fixed handling of UTF-8 encoded files by writing them in binary (via jikamens)
- Improved Full Site Delivery configuration user flow on the General and CDN settings screens
- Improved content type matching and cache hits as a result
- Improved minify file locking logic
- Improved visual language of the compatibility test (via Furniel)
- Improved configuration file management
- Improved MaxCDN set up wizard
- Improved page cache's accepted query string handling to handle optional values and add support for disk enhanced mode (via amiga-500, nigrosimone)
- Improved handling of timeouts to origin push CDN providers
- Added HTTP/2 push headers for disk enhanced page caching (via nigrosimone)
- Added X-Forwarded-Proto header for use cases like HTTPS recognition behind proxies or load balancers
- Added multiple CDN support i.e. static file objects and pages, posts, feeds, API responses etc to use different respective CDN providers
- Added page caching by cookie name or value (sponsored by SQweb)
- Added toggle for CORS header to improve inter-operatbility with various CDN providers
- Added support for CDN hosted media to media library (inspired by amiga-500)
- Added object caching of AJAX calls (via andyexeter)
- Enterprise features are now available to Pro subscribers! Including reading from multiple databases concurrently and purging caches across multiple hosts via a Message Bus

## 0.9.5.4

- Fixed regression with browser caching and query strings

## 0.9.5.3

- Fixed handling of HTTP compressed documents in PHP v5.3 (via amiga-500)
- Fixed a bug with accelerated mobile pages (via nigrosimone)
- Improved reliability of minify in manual mode
- Improved JavaScript interoperability with CDATA use cases
- Improved file name generation on Windows for IIS servers
- Improved handling of # in URLs
- Improved handling of exclusions for e-commerce in Genesis Framework
- Improved handling of headers for Microsoft Azure
- Improved functionality with existing CloudFront Distributions when configuring Full Site Delivery
- Improved minify debug logging
- Improved handling of URLs that omit the protocol
- Improved handling of custom files with CDN (via amiga-500)
- Updated CSSTidy library (via nigrosimone and amiga-500)
- Added Swarmify Video Optimization Extension [Hat tip the Swarmify Team]
- Added flushing of AMP pages

## 0.9.5.2

- Fixed security issue by protecting configuration data by adding .php to relevant files
- Fixed security issue with the creation of dot folders that could be abused
- Fixed handling HTTP compression for uncached pages
- Fixed handling of .svgz files
- Added expiration headers to WebP images
- Added support for Microsoft Azure’s latest API
- Added ability to cache WP Admin. Recommended setting, is off. (Improved WP Admin performance with object caching enabled)
- Added HTTP/2 Push support for minified files
- Added option management support for wp-cli
- Improved handling of uncompressed minified files
- Improved handling of purging of modified pages / posts
- Improved compatibility with Rackspace Cloud Files
- Improved initial CDN configuration reliability
- Improved reliability of object caching
- Improved PHP 7.0 compatibility
- Improved PHP 4.3 compatibility
- Improved HTTP/2 support
- Improved CSS embed handling
- Improved reliability of object cache, transients now fallback to database
- Improved handling of cached http compressed objects

## 0.9.5.1

- Fixed missing namespace, which caused issues with other implementations of Google APIs
- Fixed handling Cloudflare zone list being incomplete for users with many zones
- Added extension to support Accelerated Mobile Pages (AMP)
- Added notification for users that are still using PHP 5.2 (end of life in 2011)
- Improved default settings
- Improved compatibility with Yoast SEO sitemap caching
- Improved compatibility with Jetpack
- Improved directory handling on IIS
- Improved backwards compatibility for 3rd party implementations against legacy W3TC functions

## 0.9.5

- Fixed XSS vulnerability
- Fixed issues with dismissing overlays
- Fixed handling of tilde in URLs
- Fixed issue with HTTP compression header when using mfunc calls
- Fixed cache ID issue with minify in network mode
- Fixed rare issue of caching empty document when some PHP errors occur in themes or plugins
- Fixed caching of query strings
- Added support for APCu Opcode Cache
- Added support for Redis
- Added support for Google Drive
- Added support for Amazon S3-compatible storage services
- Added support for PECL memcached
- Added support for srcset elements
- Added support for Rackspace CDN Origin Pull
- Added support for minification of external fonts
- Added support for WOFF2 font format
- Added support for FTPS (FTP-SSL, S-FTP)
- Added YUI Compressor's PHP Port of the CSS minifier
- Added Narcissus' JS minifier
- Added purge of parent page when attachments are added or updated
- Added Highwinds CDN provider
- Added "Validate Timestamps" option for compatible opcode caches functions like apc.stat are enabled
- Added Full Site Delivery for Pro subscribers
- Added HTTP Strict Transport Security (HSTS) support
- Added a sample extension for developers to reference
- Added Rackspace Cloud Files Multi-Region Support
- Added more support for exclusions to database cache
- Added more optionality to minifiers
- Added WPML Performance Extension
- Added use of [namespace](http://php.net/manual/en/language.namespaces.rationale.php) which creates minimum dependency on version PHP 5.3
- Improved PHP 5.6 compatibility
- Improved PHP 7 compatibility
- Improved performance menu in admin bar, including purging of specific cache engines and more
- Improved SSL interoperability
- Improved reliability of test buttons
- Improved nomenclature of caching files for higher cache hit rates
- Improved nginx compatibility
- Improved WP CLI support
- Improved Cloudflare compatibility (now using latest APIs), Cloudflare must be re-authorized
- Improved AWS API compatibility (now using latest APIs)
- Improved Rackspace Cloud Files compatibility (now using latest APIs)
- Improved page cache purge for extensions like cloudflare and other reverse proxy use cases
- Improved extension framework functionality
- Improved compatibility of headers like ETag and content encoding
- Improved template fragment caching
- Improved notifications, warnings and errors
- Improved mobile user agents detection
- Improved security with nonces and form elements
- Improved security throughout the codebase
- Improved detail of debug messages
- Improved Amazon SNS security (validation)
- Improved minify's ability to match script tags without type attribute

## 0.9.4

- Fixed undefined w3tc_button_link
- Fixed support and other form submissions
- Fixed extension enabled key error
- Fixed Test CDN errors
- Fixed trailing slashes in custom wp content path and Minify
- Fixed WP_PLUGIN_DIR not being available when object-cache.php is loaded and W3TC constant not set
- Fixed Minify Auto and restructuring of JS code placement on page
- Fixed remove / replace drop in file on plugins page
- Fixed false positive check for legacy code
- Fixed deprecated wpdb escape
- Fixed Fragment Caching and APC anomalies
- Fixed cached configs causing 500 error on interrupted file writes
- Fixed readfile errors on servers with the functionality disabled
- Fixed false positives for license key verification
- Fixed debug information not printed on cached pages
- Fixed backwards compatibility and flushing and added doing it wrong notification
- Fixed "Prevent caching of objects after settings change"
- Fixed "Use late init" being shown as enabled with Disc:Enhanced
- Fixed missing param in APC cache method declaration
- Fixed user roles property not begin an array
- Fixed adding empty Vary header
- Fixed notice on failed upgrade licensing check
- Fixed Database Cache description text
- Fixed duplicate bb10 agents
- Fixed settings link in Minify Auto notification
- Fixed notice with undefined constant
- Fixed nginx configuration and Referrer, User Groups setting
- Fixed Genesis settings and Suhosin field name limit error
- Fixed Genesis and Fragment Caching (caching categories etc)
- Fixed CDN being enabled when creating NetDNA / MaxCDN pull zone
- Fixed NewRelic related notice in compatibility popup
- Fixed trailing slash issue in filename to url conversion
- Fixed issue with wp in subdirectory and relative minimal manual urls
- Fixed issue with widget styling
- Fixed issue with Purge All button action
- Fixed issue with exporting of settings
- Fixed issue with plugin interfering with preview theme
- Fixed issue with malformed config files
- Added caching of list of posts pages (tags, categories etc) to Genesis extension a long with flush it checkbox
- Added typecasting on expiration time in object cache drop-in
- Added capability check for save options
- Added FeedBurner extension
- Added woff support to Browser Cache
- Added new Cloudflare IPs
- Added support for WordPress defined charset and collate in CDN queue table creation
- Added WordPress SEO by Yoast extension
- Added *.less to CDN theme uploads and MIME
- Added default settings for MaxCDN Pull Zone creation
- Added call to change MaxCDN canonical header setting to match plugin setting
- Added one button default pull zone creation to MaxCDN without refresh
- Added MaxCDN authorization validation
- Added whitelist IPs notification for MaxCDN
- Added support for use of existing zones without refresh
- Added new mime types
- Added support for separate domains for frontend and admin backend
- Added Cloudflare as an extension
- Added nofollow to blogroll links
- Added DEV mode support to PRO version
- Added EDGE MODE functionality
- Improved wrapper functions in plugins.php for plugin / theme authors
- Improved reliability of NetDNA / MaxCDN API calls by using WP HTTP and not cURL
- Improved Fragment Caching debug information
- Improved preview mode, removed query string requirement
- Improved FAQ structure
- Improved empty minify/pgcache cache notification when using CDN
- Improved default settings for MaxCDN zone creation
- Improved CDN queue performance
- Improved blogmap url sanitation
- Improved MaxCDN automatic zone creation process
- Improved license key saving and Pro mode activation on Pro license purchases
- Updated EDGE MODE: Full site mirroring support for MaxCDN
- Updated translations