# Varnish Cache

> Varnish is a powerful, flexible HTTP accelerator that speeds up web applications by caching content and optimizing delivery.

Varnish Cache is an open source HTTP accelerator (reverse caching proxy) maintained by Varnish Software. It is a downstream distribution of Vinyl Cache, delivering a stable release with additional tooling and features. You install it in front of any HTTP server to cache responses, typically speeding up delivery by 300-1000x.

## Key Facts

- Type: Open source reverse caching proxy / HTTP accelerator
- License: BSD 2-Clause
- Maintained by: Varnish Software
- Based on: Vinyl Cache (upstream open source project)
- Language: C, with VCL (Varnish Configuration Language) for configuration
- Website: https://www.varnish.org/

## Key Features

- Extremely fast and scalable HTTP caching
- Built-in VCL programming language for custom caching policies
- Follows HTTP caching conventions (Cache-Control, stale-while-revalidate via grace)
- Extensive metrics and logs for complete observability
- Dynamic backends with SSL support (via vmod-reqwest)
- 19+ bundled VMODs (modules) for rate limiting, GeoIP, Redis, JSON parsing, and more
- Deployable via Docker, Kubernetes (Helm), DEB and RPM packages

## Varnish vs Varnish Cache

"Varnish" refers to the complete technology ecosystem including Varnish Cache (open source), Varnish Enterprise (commercial), and related tools. "Varnish Cache" specifically refers to the open source distribution.

## Documentation

- [Docker install guide](https://www.varnish.org/docs/install-guide/install-docker/) - Learn how to run Varnish Cache on Docker.
- [Kubernetes install guide](https://www.varnish.org/docs/install-guide/install-kubernetes/) - Learn how to run Varnish Cache on Kubernetes using the official Helm chart.
- [Debian and Ubuntu install guide](https://www.varnish.org/docs/install-guide/install-debian-ubuntu/) - Learn how to install Varnish Cache on Debian and Ubuntu
- [Red Hat Enterprise Linux and compatible distributions install guide](https://www.varnish.org/docs/install-guide/install-rhel-compatible/) - Learn how to install Varnish Cache on Red Hat Enterprise Linux and compatible distributions.
- [VSL cheatsheet](https://www.varnish.org/docs/tutorials/vsl-cheatsheet/) - varnishlog, varnishncsa and ready-to-use VSL queries
- [Mixed content and ERR_TOO_MANY_REDIRECTS errors in WordPress when using Varnish](https://www.varnish.org/docs/tutorials/mixed-content-err-too-many-redirects-wordpress-varnish/) - Fixing mixed content issues and avoiding the ERR_TOO_MANY_REDIRECTS error in WordPress when using Varnish.
- [HTTP caching basics](https://www.varnish.org/docs/tutorials/http-caching-basics/) - Learn the basics of HTTP caching and learn how to control the behavior of a web cache by using conventional HTTP headers
- [Bypassing the cache for specific URL patterns](https://www.varnish.org/docs/tutorials/bypass-cache-urls/) - How to bypass the cache for specific URLs and URL patterns in Varnish
- [Performing HTTP redirections in Varnish](https://www.varnish.org/docs/tutorials/redirect/) - Trigger vcl_synth and use a synthetic HTTP response to perform a HTTP redirections in Varnish
- [Using multiple backends in Varnish](https://www.varnish.org/docs/tutorials/multiple-backends/) - Using multiple backends in Varnish
- [Banning content from Varnish](https://www.varnish.org/docs/tutorials/ban/) - Use Varnish's ban mechanism to remove cached objects from the cache.
- [Purging content from Varnish](https://www.varnish.org/docs/tutorials/purge/) - Use the purge return action in VCL to remove cached objects from the Varnish cache.
- [Configuring Varnish for Drupal](https://www.varnish.org/docs/tutorials/configuring-varnish-drupal/) - Configuring Varnish for Drupal
- [Configuring Varnish for Magento](https://www.varnish.org/docs/tutorials/configuring-varnish-magento/) - Configuring Varnish for Magento
- [Configuring Varnish for WordPress](https://www.varnish.org/docs/tutorials/configuring-varnish-wordpress/) - Configuring Varnish for WordPress
- [Example VCL template](https://www.varnish.org/docs/tutorials/example-vcl-template/) - An example VCL template for Varnish
- [How to configure TLS in Varnish](https://www.varnish.org/docs/tutorials/tls/) - Learn how to configure TLS in Varnish for both client TLS and backend TLS
- [Change your web server port to run Varnish on the same server](https://www.varnish.org/docs/tutorials/change-web-server-port-for-varnish/) - Learn how to reconfigure the port of your Apache or Nginx web server to run Varnish on the same machine as your web server.
- [Achieving a high hitrate](https://www.varnish.org/docs/users-guide/increasing-your-hitrate/)
- [ACLs](https://www.varnish.org/docs/users-guide/vcl-example-acls/)
- [Adding WebSockets support](https://www.varnish.org/docs/users-guide/vcl-example-websockets/)
- [Altering the backend response](https://www.varnish.org/docs/users-guide/vcl-example-manipulating-responses/)
- [Backend servers](https://www.varnish.org/docs/tutorials/backend_servers/)
- [Backend servers](https://www.varnish.org/docs/users-guide/vcl-backends/)
- [Built-in VCL](https://www.varnish.org/docs/users-guide/vcl-built-in-code/)
- [Changes in Varnish 4.1](https://www.varnish.org/docs/whats-new/changes-4.1/)
- [Changes in Varnish 5.0](https://www.varnish.org/docs/whats-new/changes-5.0/)
- [Changes in Varnish 5.1](https://www.varnish.org/docs/whats-new/changes-5.1/)
- [Changes in Varnish 5.2](https://www.varnish.org/docs/whats-new/changes-5.2/)
- [Changes in Varnish 6.0](https://www.varnish.org/docs/whats-new/changes-6.0/)
- [Changes in Varnish 6.1](https://www.varnish.org/docs/whats-new/changes-6.1/)
- [Changes in Varnish 6.2](https://www.varnish.org/docs/whats-new/changes-6.2/)
- [Changes in Varnish 6.3](https://www.varnish.org/docs/whats-new/changes-6.3/)
- [Changes in Varnish 6.4.0](https://www.varnish.org/docs/whats-new/changes-6.4/)
- [Changes in Varnish 6.5.0](https://www.varnish.org/docs/whats-new/changes-6.5/)
- [Changes in Varnish 6.6](https://www.varnish.org/docs/whats-new/changes-6.6/)
- [Changes in Varnish 7.0](https://www.varnish.org/docs/whats-new/changes-7.0/)
- [Changes in Varnish 7.1](https://www.varnish.org/docs/whats-new/changes-7.1/)
- [Changes in Varnish 7.2](https://www.varnish.org/docs/whats-new/changes-7.2/)
- [Changes in Varnish 7.3](https://www.varnish.org/docs/whats-new/changes-7.3/)
- [Changes in Varnish 7.4](https://www.varnish.org/docs/whats-new/changes-7.4/)
- [Changes in Varnish 7.5](https://www.varnish.org/docs/whats-new/changes-7.5/)
- [Changes in Varnish 7.6](https://www.varnish.org/docs/whats-new/changes-7.6/)
- [Changes in Varnish Cache 9.0](https://www.varnish.org/docs/whats-new/changes-9.0/)
- [Changes in Varnish-Cache 7.7](https://www.varnish.org/docs/whats-new/changes-7.7/)
- [Changes in Varnish-Cache 8.0](https://www.varnish.org/docs/whats-new/changes-8.0/)
- [CLI - bossing Varnish around](https://www.varnish.org/docs/users-guide/run_cli/)
- [Compression](https://www.varnish.org/docs/users-guide/compression/)
- [Content composition with Edge Side Includes](https://www.varnish.org/docs/users-guide/esi/)
- [Device detection](https://www.varnish.org/docs/users-guide/devicedetection/)
- [Getting help with Varnish Cache?](https://www.varnish.org/getting-help/) - Learn how to get help with Varnish Cache through various channels, including commercial support
- [Grace mode and keep](https://www.varnish.org/docs/users-guide/vcl-grace/)
- [Hashing](https://www.varnish.org/docs/users-guide/vcl-hashing/)
- [Logging in Varnish](https://www.varnish.org/docs/users-guide/operation-logging/)
- [Manipulating request headers in VCL](https://www.varnish.org/docs/users-guide/vcl-example-manipulating-headers/)
- [Now what?](https://www.varnish.org/docs/tutorials/now_what/)
- [Older Varnish HTTP Cache news](https://www.varnish.org/releases/oldnews/)
- [Parameters](https://www.varnish.org/docs/users-guide/params/)
- [Peculiarities](https://www.varnish.org/docs/tutorials/peculiarities/)
- [Purging and banning](https://www.varnish.org/docs/users-guide/purging/)
- [Put Varnish on port 80](https://www.varnish.org/docs/tutorials/putting_varnish_on_port_80/)
- [Reporting and statistics](https://www.varnish.org/docs/users-guide/report/)
- [Request and response VCL objects](https://www.varnish.org/docs/users-guide/vcl-variables/)
- [Required command line arguments](https://www.varnish.org/docs/users-guide/command-line/)
- [Security first](https://www.varnish.org/docs/users-guide/run_security/)
- [Separate VCL files](https://www.varnish.org/docs/users-guide/vcl-separate/)
- [Shell Tricks](https://www.varnish.org/docs/reference/shell_tricks/)
- [Sizing your cache](https://www.varnish.org/docs/users-guide/sizing-your-cache/)
- [Starting and running Varnish](https://www.varnish.org/docs/users-guide/running/)
- [Starting Varnish](https://www.varnish.org/docs/tutorials/starting_varnish/)
- [Statistics](https://www.varnish.org/docs/users-guide/operation-statistics/)
- [Storage backends](https://www.varnish.org/docs/users-guide/storage-backends/)
- [The Big Varnish Picture](https://www.varnish.org/docs/users-guide/intro/)
- [Troubleshooting Varnish](https://www.varnish.org/docs/users-guide/troubleshooting/)
- [Upgrading to Varnish 4.0](https://www.varnish.org/docs/whats-new/upgrading-4.0/)
- [Upgrading to Varnish 4.1](https://www.varnish.org/docs/whats-new/upgrading-4.1/)
- [Upgrading to Varnish 5.0](https://www.varnish.org/docs/whats-new/upgrading-5.0/)
- [Upgrading to Varnish 5.1](https://www.varnish.org/docs/whats-new/upgrading-5.1/)
- [Upgrading to Varnish 5.2](https://www.varnish.org/docs/whats-new/upgrading-5.2/)
- [Upgrading to Varnish 6.0](https://www.varnish.org/docs/whats-new/upgrading-6.0/)
- [Upgrading to Varnish 6.1](https://www.varnish.org/docs/whats-new/upgrading-6.1/)
- [Upgrading to Varnish 6.2](https://www.varnish.org/docs/whats-new/upgrading-6.2/)
- [Upgrading to Varnish 6.3](https://www.varnish.org/docs/whats-new/upgrading-6.3/)
- [Upgrading to Varnish 6.4.0](https://www.varnish.org/docs/whats-new/upgrading-6.4/)
- [Upgrading to Varnish 6.5.0](https://www.varnish.org/docs/whats-new/upgrading-6.5/)
- [Upgrading to Varnish 6.6](https://www.varnish.org/docs/whats-new/upgrading-6.6/)
- [Upgrading to Varnish 7.0](https://www.varnish.org/docs/whats-new/upgrading-7.0/)
- [Upgrading to Varnish 7.1](https://www.varnish.org/docs/whats-new/upgrading-7.1/)
- [Upgrading to Varnish 7.2](https://www.varnish.org/docs/whats-new/upgrading-7.2/)
- [Upgrading to Varnish 7.3](https://www.varnish.org/docs/whats-new/upgrading-7.3/)
- [Upgrading to Varnish 7.4](https://www.varnish.org/docs/whats-new/upgrading-7.4/)
- [Upgrading to Varnish 7.5](https://www.varnish.org/docs/whats-new/upgrading-7.5/)
- [Upgrading to Varnish 7.6](https://www.varnish.org/docs/whats-new/upgrading-7.6/)
- [Upgrading to Varnish Cache 9.0](https://www.varnish.org/docs/whats-new/upgrading-9.0/)
- [Upgrading to Varnish-Cache 7.7](https://www.varnish.org/docs/whats-new/upgrading-7.7/)
- [Upgrading to Varnish-Cache 8.0](https://www.varnish.org/docs/whats-new/upgrading-8.0/)
- [Using inline C to extend Varnish](https://www.varnish.org/docs/users-guide/vcl-inline-c/)
- [Varnish 5.0 Release Note](https://www.varnish.org/docs/whats-new/relnote-5.0/)
- [Varnish and Website Performance](https://www.varnish.org/docs/users-guide/performance/)
- [Varnish Command Line Interface](https://www.varnish.org/docs/reference/varnish-cli/)
- [Varnish Processing States](https://www.varnish.org/docs/reference/states/)
- [varnish-counters](https://www.varnish.org/docs/reference/varnish-counters/)
- [Varnish: The beef in the sandwich](https://www.varnish.org/docs/tutorials/introduction/)
- [varnishadm](https://www.varnish.org/docs/reference/varnishadm/)
- [varnishd](https://www.varnish.org/docs/reference/varnishd/)
- [varnishhist](https://www.varnish.org/docs/reference/varnishhist/)
- [varnishlog](https://www.varnish.org/docs/reference/varnishlog/)
- [varnishncsa](https://www.varnish.org/docs/reference/varnishncsa/)
- [varnishstat](https://www.varnish.org/docs/reference/varnishstat/)
- [varnishtest](https://www.varnish.org/docs/reference/varnishtest/)
- [varnishtop](https://www.varnish.org/docs/reference/varnishtop/)
- [VCL](https://www.varnish.org/docs/reference/vcl/)
- [VCL - Varnish Configuration Language](https://www.varnish.org/docs/users-guide/vcl/)
- [VCL Examples](https://www.varnish.org/docs/users-guide/vcl-examples/)
- [VCL Syntax](https://www.varnish.org/docs/users-guide/vcl-syntax/)
- [VCL-backends](https://www.varnish.org/docs/reference/vcl-backend/)
- [VCL-probe](https://www.varnish.org/docs/reference/vcl-probe/)
- [VCL-steps](https://www.varnish.org/docs/reference/vcl-step/)
- [VCL-Variables](https://www.varnish.org/docs/reference/vcl-var/)
- [VCLI protocol - Scripting the CLI interface](https://www.varnish.org/docs/reference/cli_protocol/)
- [VEXT - Varnish Extensions](https://www.varnish.org/docs/reference/vext/)
- [VMOD - Varnish Modules](https://www.varnish.org/docs/reference/vmod/)
- [VMOD blob - Utilities for the VCL blob type, encoding and decoding](https://www.varnish.org/docs/reference/vmod_blob/)
- [VMOD cookie - Varnish Cookie Module](https://www.varnish.org/docs/reference/vmod_cookie/)
- [VMOD directors - Varnish Directors Module](https://www.varnish.org/docs/reference/vmod_directors/)
- [VMOD h2 - Module to control the built-in HTTP2 transport](https://www.varnish.org/docs/reference/vmod_h2/)
- [VMOD proxy - Varnish Module to extract TLV attributes from PROXYv2](https://www.varnish.org/docs/reference/vmod_proxy/)
- [VMOD purge - Varnish Purge Module](https://www.varnish.org/docs/reference/vmod_purge/)
- [VMOD std - Varnish Standard Module](https://www.varnish.org/docs/reference/vmod_std/)
- [VMOD unix - Utilities for Unix domain sockets](https://www.varnish.org/docs/reference/vmod_unix/)
- [VMOD vtc - Utility module for varnishtest](https://www.varnish.org/docs/reference/vmod_vtc/)
- [Vmod_Math](https://www.varnish.org/docs/reference/vmod_math/)
- [VSL](https://www.varnish.org/docs/reference/vsl/)
- [vsl-query](https://www.varnish.org/docs/reference/vsl-query/)
- [VSM: Shared Memory Logging and Statistics](https://www.varnish.org/docs/reference/vsm/)
- [VSV00001 DoS vulnerability](https://www.varnish.org/docs/security/vsv00001/)
- [VSV00002 Data leak - ‘-sfile’ Stevedore transient objects](https://www.varnish.org/docs/security/vsv00002/)
- [VSV00003 DoS attack vector](https://www.varnish.org/docs/security/vsv00003/)
- [VSV00003 DoS attack vector VCL mitigation](https://www.varnish.org/docs/security/vsv00003-mitigation/)
- [VSV00004 Workspace information leak](https://www.varnish.org/docs/security/vsv00004/)
- [VSV00005 Varnish HTTP Proxy Protocol V2 Denial of Service](https://www.varnish.org/docs/security/vsv00005/)
- [VSV00006 varnish-modules Denial of Service](https://www.varnish.org/docs/security/vsv00006/)
- [VSV00007 Varnish HTTP/2 Request Smuggling Attack](https://www.varnish.org/docs/security/vsv00007/)
- [VSV00008 Varnish HTTP/1 Request Smuggling Vulnerability](https://www.varnish.org/docs/security/vsv00008/)
- [VSV00009 Varnish Denial of Service Vulnerability](https://www.varnish.org/docs/security/vsv00009/)
- [VSV00010 Varnish Request Smuggling Vulnerability](https://www.varnish.org/docs/security/vsv00010/)
- [VSV00011 Varnish HTTP/2 Request Forgery Vulnerability](https://www.varnish.org/docs/security/vsv00011/)
- [VSV00012 Base64 decoding vulnerability in vmod-digest](https://www.varnish.org/docs/security/vsv00012/)
- [VSV00013 Varnish HTTP/2 Rapid Reset Attack](https://www.varnish.org/docs/security/vsv00013/)
- [VSV00014 Varnish HTTP/2 Broke Window Attack](https://www.varnish.org/docs/security/vsv00014/)
- [VSV00015 Varnish HTTP/1 client-side desync vulnerability](https://www.varnish.org/docs/security/vsv00015/)
- [VSV00016 Request Smuggling Attack](https://www.varnish.org/docs/security/vsv00016/)
- [VSV00017 Varnish HTTP/2 Made You Reset Attack](https://www.varnish.org/docs/security/vsv00017/)
- [VSV00018 Varnish Cache absolute form parsing deficiency](https://www.varnish.org/docs/security/vsv00018/)
- [VTC](https://www.varnish.org/docs/reference/vtc/)
- [VTLA - Varnish Three Letter Acronyms](https://www.varnish.org/docs/reference/vtla/)
- [Writing a Director](https://www.varnish.org/docs/reference/directors/)
- [What is Varnish Cache?](https://www.varnish.org/what-is-varnish-cache/) - Learn about the differences between Varnish, Varnish Cache and Vinyl Cache
- [Varnish Cache 8.0.0](https://www.varnish.org/releases/8.0.0/) - Varnish Cache 8.0.0 release and download information.
- [Varnish Cache 6.0.16](https://www.varnish.org/releases/6.0.16/) - Varnish Cache 6.0.16 release and download information.
- [Varnish Cache 7.6.5](https://www.varnish.org/releases/7.6.5/) - Varnish Cache 7.6.5 release and download information.
- [Varnish Cache 7.7.3](https://www.varnish.org/releases/7.7.3/) - Varnish Cache 7.7.3 release and download information.
- [Varnish Cache 6.0.15](https://www.varnish.org/releases/6.0.15/) - Varnish Cache 6.0.15 release and download information.
- [Varnish Cache 7.6.4](https://www.varnish.org/releases/7.6.4/) - Varnish Cache 7.6.4 release and download information.
- [Varnish Cache 7.7.2](https://www.varnish.org/releases/7.7.2/) - Varnish Cache 7.7.2 release and download information.
- [Varnish Cache 6.0.14](https://www.varnish.org/releases/6.0.14/) - Varnish Cache 6.0.14 release and download information.
- [Varnish Cache 7.6.3](https://www.varnish.org/releases/7.6.3/) - Varnish Cache 7.6.3 release and download information.
- [Varnish Cache 7.7.1](https://www.varnish.org/releases/7.7.1/) - Varnish Cache 7.7.1 release and download information.
- [Hands-on varnishtest](https://www.varnish.org/docs/tutorials/hands-on-varnishtest/) - Learn varnishtest by examples
- [Varnish Cache 7.6.2](https://www.varnish.org/releases/7.6.2/) - Varnish Cache 7.6.2 release and download information.
- [Varnish Cache 7.7.0](https://www.varnish.org/releases/7.7.0/) - Varnish Cache 7.7.0 release and download information.
- [Varnish Cache 7.6.1](https://www.varnish.org/releases/7.6.1/) - Varnish Cache 7.6.1 release and download information.
- [Varnish Cache 7.6.0](https://www.varnish.org/releases/7.6.0/) - Varnish Cache 7.6.0 release and download information.
- [Generating Varnish access logs with varnishncsa](https://www.varnish.org/docs/tutorials/varnish-access-logs-varnishncsa/) - How to generate NCSA compatible access logs for Varnish with varnishncsa.
- [Caching POST requests in Varnish](https://www.varnish.org/docs/tutorials/caching-post-requests-varnish/) - Learn how to cache POST requests with Varnish
- [Configuring Varnish systemd services](https://www.varnish.org/docs/tutorials/configuring-varnish-systemd-services/) - Learn how to configure systemd services to manage Varnish.
- [Logging cache hits and misses](https://www.varnish.org/docs/tutorials/logging-cache-hits-misses-varnish/) - Logging cache hits and misses by tracking the request type (hit, miss, pass, pipe, synth, or hitmiss) in a custom x-cache request header
- [Varnish Cache 6.0.13](https://www.varnish.org/releases/6.0.13/) - Varnish Cache 6.0.13 release and download information.
- [Varnish Cache 7.3.2](https://www.varnish.org/releases/7.3.2/) - Varnish Cache 7.3.2 release and download information.
- [Varnish Cache 7.4.3](https://www.varnish.org/releases/7.4.3/) - Varnish Cache 7.4.3 release and download information.
- [Varnish Cache 7.5.0](https://www.varnish.org/releases/7.5.0/) - Varnish Cache 7.5.0 release and download information.
- [Varnish Cache 6.0.12](https://www.varnish.org/releases/6.0.12/) - Varnish Cache 6.0.12 release and download information.
- [Varnish Cache 7.3.1](https://www.varnish.org/releases/7.3.1/) - Varnish Cache 7.3.1 release and download information.
- [Varnish Cache 7.4.2](https://www.varnish.org/releases/7.4.2/) - Varnish Cache 7.4.2 release and download information.
- [Varnish Cache 7.4.1](https://www.varnish.org/releases/7.4.1/) - Varnish Cache 7.4.1 release and download information.
- [Varnish Cache 7.4.0](https://www.varnish.org/releases/7.4.0/) - Varnish Cache 7.4.0 release and download information.
- [Varnishlog: measure your Varnish cache performance](https://www.varnish.org/docs/tutorials/varnishlog/) - How to measure your Varnish cache performance with varnishlog.
- [Varnish Cache 7.3.0](https://www.varnish.org/releases/7.3.0/) - Varnish Cache 7.3.0 release and download information.
- [Varnish Cache 6.0.11](https://www.varnish.org/releases/6.0.11/) - Varnish Cache 6.0.11 release and download information.
- [Varnish Cache 7.2.1](https://www.varnish.org/releases/7.2.1/) - Varnish Cache 7.2.1 release and download information.
- [Varnish Cache 7.1.2](https://www.varnish.org/releases/7.1.2/) - Varnish Cache 7.1.2 release and download information.
- [Varnish Cache 7.2.0](https://www.varnish.org/releases/7.2.0/) - Varnish Cache 7.2.0 release and download information.
- [Varnish Cache 7.0.3](https://www.varnish.org/releases/7.0.3/) - Varnish Cache 7.0.3 release and download information.
- [Varnish Cache 7.1.1](https://www.varnish.org/releases/7.1.1/) - Varnish Cache 7.1.1 release and download information.
- [Avoiding HTTP to HTTPS redirect loops in Varnish](https://www.varnish.org/docs/tutorials/avoid-http-to-https-redirect-loops-varnish/) - How to avoid HTTP to HTTPS redirect loops in Varnish by creating protocol-based cached variations.
- [Varnish Cache 7.1.0](https://www.varnish.org/releases/7.1.0/) - Varnish Cache 7.1.0 release and download information.
- [Varnish Cache 6.0.10](https://www.varnish.org/releases/6.0.10/) - Varnish Cache 6.0.10 release and download information.
- [Varnish Cache 6.6.2](https://www.varnish.org/releases/6.6.2/) - Varnish Cache 6.6.2 release and download information.
- [Varnish Cache 7.0.2](https://www.varnish.org/releases/7.0.2/) - Varnish Cache 7.0.2 release and download information.
- [Troubleshooting Varnish](https://www.varnish.org/docs/tutorials/troubleshooting-varnish/) - How to troubleshoot Varnish when problems occur.
- [Testing Varnish with varnishtest](https://www.varnish.org/docs/tutorials/testing-varnish-varnishtest/) - The Varnish Configuration Language (VCL) is a domain-specific programming language used by Varnish to control request handling, routing, caching, and several other aspects.
- [Varnish Configuration Language (VCL)](https://www.varnish.org/docs/tutorials/varnish-configuration-language-vcl/) - The Varnish Configuration Language (VCL) is a domain-specific programming language used by Varnish to control request handling, routing, caching, and several other aspects.
- [Varnish Cache 6.0.9](https://www.varnish.org/releases/6.0.9/) - Varnish Cache 6.0.9 release and download information.
- [Varnish Cache 7.0.1](https://www.varnish.org/releases/7.0.1/) - Varnish Cache 7.0.1 release and download information.
- [Load a synthetic output template from a file](https://www.varnish.org/docs/tutorials/vcl-synthetic-output-template-file/) - Load the VCL output template for vcl_synth and vcl_backend_error from a file.
- [Varnish built-in VCL](https://www.varnish.org/docs/tutorials/varnish-builtin-vcl/) - Learn about Varnish's default behavior by looking at the various subroutines that are part of the built-in VCL.
- [Using basic authentication in VCL backend probes](https://www.varnish.org/docs/tutorials/vcl-backend-probe-basic-authentication/) - When your backend requires authorized access via basic authentication, you need to configure the health probe for your backend in VCL to support basic authentication.
- [Varnish Cache 7.0.0](https://www.varnish.org/releases/7.0.0/) - Varnish Cache 7.0.0 release and download information.
- [Varnish Cache 6.0.8](https://www.varnish.org/releases/6.0.8/) - Varnish Cache 6.0.8 release and download information.
- [Varnish Cache 6.5.2](https://www.varnish.org/releases/6.5.2/) - Varnish Cache 6.5.2 release and download information.
- [Varnish Cache 6.6.1](https://www.varnish.org/releases/6.6.1/) - Varnish Cache 6.6.1 release and download information.
- [Varnish Cache 6.6.0](https://www.varnish.org/releases/6.6.0/) - Varnish Cache 6.6.0 release and download information.
- [Varnish Cache 6.0.7](https://www.varnish.org/releases/6.0.7/) - Varnish Cache 6.0.7 release and download information.
- [Varnish Cache 6.5.1](https://www.varnish.org/releases/6.5.1/) - Varnish Cache 6.5.1 release and download information.
- [Varnish Cache 6.5.0](https://www.varnish.org/releases/6.5.0/) - Varnish Cache 6.5.0 release and download information.
- [Cache invalidation](https://www.varnish.org/docs/tutorials/cache-invalidation/) - How to invalidate and purge your cache
- [Varnish Cache 6.4.0](https://www.varnish.org/releases/6.4.0/) - Varnish Cache 6.4.0 release and download information.
- [Varnish Cache 6.0.6](https://www.varnish.org/releases/6.0.6/) - Varnish Cache 6.0.6 release and download information.
- [Varnish Cache 6.2.3](https://www.varnish.org/releases/6.2.3/) - Varnish Cache 6.2.3 release and download information.
- [Varnish Cache 6.3.2](https://www.varnish.org/releases/6.3.2/) - Varnish Cache 6.3.2 release and download information.
- [Varnish Cache 6.0.5](https://www.varnish.org/releases/6.0.5/) - Varnish Cache 6.0.5 release and download information.
- [Varnish Cache 6.2.2](https://www.varnish.org/releases/6.2.2/) - Varnish Cache 6.2.2 release and download information.
- [Varnish Cache 6.3.1](https://www.varnish.org/releases/6.3.1/) - Varnish Cache 6.3.1 release and download information.
- [Varnish Cache 6.3.0](https://www.varnish.org/releases/6.3.0/) - Varnish Cache 6.3.0 release and download information.
- [Varnish Cache 6.0.4](https://www.varnish.org/releases/6.0.4/) - Varnish Cache 6.0.4 release and download information.
- [Varnish Cache 6.2.1](https://www.varnish.org/releases/6.2.1/) - Varnish Cache 6.2.1 release and download information.
- [Varnish Cache 6.2.0](https://www.varnish.org/releases/6.2.0/) - Varnish Cache 6.2.0 release and download information.
- [Varnish Cache 6.0.3](https://www.varnish.org/releases/6.0.3/) - Varnish Cache 6.0.3 release and download information.
- [Varnish Cache 4.1.11](https://www.varnish.org/releases/4.1.11/) - Varnish Cache 4.1.11 release and download information.
- [Varnish Cache 6.0.2](https://www.varnish.org/releases/6.0.2/) - Varnish Cache 6.0.2 release and download information.
- [Varnish Cache 6.1.1](https://www.varnish.org/releases/6.1.1/) - Varnish Cache 6.1.1 release and download information.
- [Varnish Cache 6.1.0](https://www.varnish.org/releases/6.1.0/) - Varnish Cache 6.1.0 release and download information.
- [Varnish Cache 6.0.1](https://www.varnish.org/releases/6.0.1/) - Varnish Cache 6.0.1 release and download information.
- [Varnish Cache 4.1.10](https://www.varnish.org/releases/4.1.10/) - Varnish Cache 4.1.10 release and download information.
- [Varnish Cache 6.0.0](https://www.varnish.org/releases/6.0.0/) - Varnish Cache 6.0.0 release and download information.
- [Varnish Cache 4.1.9](https://www.varnish.org/releases/4.1.9/) - Varnish Cache 4.1.9 release and download information.
- [Varnish Cache 5.2.1](https://www.varnish.org/releases/5.2.1/) - Varnish Cache 5.2.1 release and download information.
- [Varnish Cache 5.2.0](https://www.varnish.org/releases/5.2.0/) - Varnish Cache 5.2.0 release and download information.
- [Varnish Cache 0.9](https://www.varnish.org/releases/0.9/) - Varnish Cache 0.9 release and download information.
- [Varnish Cache 0.9.1](https://www.varnish.org/releases/0.9.1/) - Varnish Cache 0.9.1 release and download information.
- [Varnish Cache 1.0.1](https://www.varnish.org/releases/1.0.1/) - Varnish Cache 1.0.1 release and download information.
- [Varnish Cache 1.0.2](https://www.varnish.org/releases/1.0.2/) - Varnish Cache 1.0.2 release and download information.
- [Varnish Cache 1.0.3](https://www.varnish.org/releases/1.0.3/) - Varnish Cache 1.0.3 release and download information.
- [Varnish Cache 2.0.1](https://www.varnish.org/releases/2.0.1/) - Varnish Cache 2.0.1 release and download information.
- [Varnish Cache 2.0.2](https://www.varnish.org/releases/2.0.2/) - Varnish Cache 2.0.2 release and download information.
- [Varnish Cache 2.0.3](https://www.varnish.org/releases/2.0.3/) - Varnish Cache 2.0.3 release and download information.
- [Varnish Cache 2.1.3](https://www.varnish.org/releases/2.1.3/) - Varnish Cache 2.1.3 release and download information.
- [Varnish Cache 4.1.0](https://www.varnish.org/releases/4.1.0/) - Varnish Cache 4.1.0 release and download information.
- [Varnish Cache 4.1.1](https://www.varnish.org/releases/4.1.1/) - Varnish Cache 4.1.1 release and download information.
- [Varnish Cache 4.0.5](https://www.varnish.org/releases/4.0.5/) - Varnish Cache 4.0.5 release and download information.
- [Varnish Cache 4.1.8](https://www.varnish.org/releases/4.1.8/) - Varnish Cache 4.1.8 release and download information.
- [Varnish Cache 5.1.3](https://www.varnish.org/releases/5.1.3/) - Varnish Cache 5.1.3 release and download information.
- [Varnish Cache 4.1.7](https://www.varnish.org/releases/4.1.7/) - Varnish Cache 4.1.7 release and download information.
- [Varnish Cache 5.1.2](https://www.varnish.org/releases/5.1.2/) - Varnish Cache 5.1.2 release and download information.
- [Varnish Cache 5.1.1](https://www.varnish.org/releases/5.1.1/) - Varnish Cache 5.1.1 release and download information.
- [Varnish Cache 4.1.4](https://www.varnish.org/releases/4.1.4/) - Varnish Cache 4.1.4 release and download information.
- [Varnish Cache 4.1.5](https://www.varnish.org/releases/4.1.5/) - Varnish Cache 4.1.5 release and download information.
- [Varnish Cache 4.0.4](https://www.varnish.org/releases/4.0.4/) - Varnish Cache 4.0.4 release and download information.
- [Varnish Cache 5.0.0](https://www.varnish.org/releases/5.0.0/) - Varnish Cache 5.0.0 release and download information.
- [Varnish Cache 4.1.3](https://www.varnish.org/releases/4.1.3/) - Varnish Cache 4.1.3 release and download information.
- [Varnish Cache 4.1.6](https://www.varnish.org/releases/4.1.6/) - Varnish Cache 4.1.6 release and download information.
- [Varnish Cache 4.1.2](https://www.varnish.org/releases/4.1.2/) - Varnish Cache 4.1.2 release and download information.
- [Varnish Cache 3.0.7](https://www.varnish.org/releases/3.0.7/) - Varnish Cache 3.0.7 release and download information.
- [Varnish Cache 4.0.3](https://www.varnish.org/releases/4.0.3/) - Varnish Cache 4.0.3 release and download information.
- [Varnish Cache 3.0.6](https://www.varnish.org/releases/3.0.6/) - Varnish Cache 3.0.6 release and download information.
- [Varnish Cache 4.0.2](https://www.varnish.org/releases/4.0.2/) - Varnish Cache 4.0.2 release and download information.
- [Varnish Cache 4.0.1](https://www.varnish.org/releases/4.0.1/) - Varnish Cache 4.0.1 release and download information.
- [Varnish Cache 4.0.0](https://www.varnish.org/releases/4.0.0/) - Varnish Cache 4.0.0 release and download information.
- [Varnish Cache 3.0.5](https://www.varnish.org/releases/3.0.5/) - Varnish Cache 3.0.5 release and download information.
- [Varnish Cache 3.0.4](https://www.varnish.org/releases/3.0.4/) - Varnish Cache 3.0.4 release and download information.
- [Varnish Cache 3.0.3](https://www.varnish.org/releases/3.0.3/) - Varnish Cache 3.0.3 release and download information.
- [Varnish Cache 3.0.2](https://www.varnish.org/releases/3.0.2/) - Varnish Cache 3.0.2 release and download information.
- [Varnish Cache 3.0.1](https://www.varnish.org/releases/3.0.1/) - Varnish Cache 3.0.1 release and download information.
- [Varnish Cache 3.0.0](https://www.varnish.org/releases/3.0.0/) - Varnish Cache 3.0.0 release and download information.
- [Varnish Cache 2.1.5](https://www.varnish.org/releases/2.1.5/) - Varnish Cache 2.1.5 release and download information.
- [Varnish Cache 2.1.4](https://www.varnish.org/releases/2.1.4/) - Varnish Cache 2.1.4 release and download information.
- [Varnish Cache 2.1.2](https://www.varnish.org/releases/2.1.2/) - Varnish Cache 2.1.2 release and download information.
- [Varnish Cache 2.1.1](https://www.varnish.org/releases/2.1.1/) - Varnish Cache 2.1.1 release and download information.
- [Varnish Cache 2.1](https://www.varnish.org/releases/2.1/) - Varnish Cache 2.1 release and download information.
- [Varnish Cache 2.0.6](https://www.varnish.org/releases/2.0.6/) - Varnish Cache 2.0.6 release and download information.
- [Varnish Cache 2.0.5](https://www.varnish.org/releases/2.0.5/) - Varnish Cache 2.0.5 release and download information.
- [Varnish Cache 2.0.4](https://www.varnish.org/releases/2.0.4/) - Varnish Cache 2.0.4 release and download information.
- [Varnish Cache 2.0](https://www.varnish.org/releases/2/) - Varnish Cache 2.0 release and download information.
- [Varnish Cache 1.1.2](https://www.varnish.org/releases/1.1.2/) - Varnish Cache 1.1.2 release and download information.
- [Varnish Cache 1.1.1](https://www.varnish.org/releases/1.1.1/) - Varnish Cache 1.1.1 release and download information.
- [Varnish Cache 1.0.4](https://www.varnish.org/releases/1.0.4/) - Varnish Cache 1.0.4 release and download information.
- [Varnish Cache 1.1](https://www.varnish.org/releases/1.1/) - Varnish Cache 1.1 release and download information.
- [Varnish Cache 1.0](https://www.varnish.org/releases/1/) - Varnish Cache 1.0 release and download information.
- [Object lifetimes: TTL, Grace, Keep](https://www.varnish.org/docs/tutorials/object-lifetimes/) - Learn how object lifetimes work in Varnish: from TTL, to Grace and Keep.
- [Varnish monitoring](https://www.varnish.org/docs/tutorials/varnish-monitoring/) - Monitoring your Varnish installation


## Sections

- [Releases & Downloads](https://www.varnish.org/releases/)
- [Older Varnish HTTP Cache news](https://www.varnish.org/releases/oldnews/)
- [Varnish Cache 8.0.0](https://www.varnish.org/releases/8.0.0/) - Varnish Cache 8.0.0 release and download information.
- [Varnish Cache 6.0.16](https://www.varnish.org/releases/6.0.16/) - Varnish Cache 6.0.16 release and download information.
- [Varnish Cache 7.6.5](https://www.varnish.org/releases/7.6.5/) - Varnish Cache 7.6.5 release and download information.
- [Varnish Cache 7.7.3](https://www.varnish.org/releases/7.7.3/) - Varnish Cache 7.7.3 release and download information.
- [Varnish Cache 6.0.15](https://www.varnish.org/releases/6.0.15/) - Varnish Cache 6.0.15 release and download information.
- [Varnish Cache 7.6.4](https://www.varnish.org/releases/7.6.4/) - Varnish Cache 7.6.4 release and download information.
- [Varnish Cache 7.7.2](https://www.varnish.org/releases/7.7.2/) - Varnish Cache 7.7.2 release and download information.
- [Varnish Cache 6.0.14](https://www.varnish.org/releases/6.0.14/) - Varnish Cache 6.0.14 release and download information.
- [Varnish Cache 7.6.3](https://www.varnish.org/releases/7.6.3/) - Varnish Cache 7.6.3 release and download information.
- [Varnish Cache 7.7.1](https://www.varnish.org/releases/7.7.1/) - Varnish Cache 7.7.1 release and download information.
- [Varnish Cache 7.6.2](https://www.varnish.org/releases/7.6.2/) - Varnish Cache 7.6.2 release and download information.
- [Varnish Cache 7.7.0](https://www.varnish.org/releases/7.7.0/) - Varnish Cache 7.7.0 release and download information.
- [Varnish Cache 7.6.1](https://www.varnish.org/releases/7.6.1/) - Varnish Cache 7.6.1 release and download information.
- [Varnish Cache 7.6.0](https://www.varnish.org/releases/7.6.0/) - Varnish Cache 7.6.0 release and download information.
- [Varnish Cache 6.0.13](https://www.varnish.org/releases/6.0.13/) - Varnish Cache 6.0.13 release and download information.
- [Varnish Cache 7.3.2](https://www.varnish.org/releases/7.3.2/) - Varnish Cache 7.3.2 release and download information.
- [Varnish Cache 7.4.3](https://www.varnish.org/releases/7.4.3/) - Varnish Cache 7.4.3 release and download information.
- [Varnish Cache 7.5.0](https://www.varnish.org/releases/7.5.0/) - Varnish Cache 7.5.0 release and download information.
- [Varnish Cache 6.0.12](https://www.varnish.org/releases/6.0.12/) - Varnish Cache 6.0.12 release and download information.
- [Varnish Cache 7.3.1](https://www.varnish.org/releases/7.3.1/) - Varnish Cache 7.3.1 release and download information.
- [Varnish Cache 7.4.2](https://www.varnish.org/releases/7.4.2/) - Varnish Cache 7.4.2 release and download information.
- [Varnish Cache 7.4.1](https://www.varnish.org/releases/7.4.1/) - Varnish Cache 7.4.1 release and download information.
- [Varnish Cache 7.4.0](https://www.varnish.org/releases/7.4.0/) - Varnish Cache 7.4.0 release and download information.
- [Varnish Cache 7.3.0](https://www.varnish.org/releases/7.3.0/) - Varnish Cache 7.3.0 release and download information.
- [Varnish Cache 6.0.11](https://www.varnish.org/releases/6.0.11/) - Varnish Cache 6.0.11 release and download information.
- [Varnish Cache 7.2.1](https://www.varnish.org/releases/7.2.1/) - Varnish Cache 7.2.1 release and download information.
- [Varnish Cache 7.1.2](https://www.varnish.org/releases/7.1.2/) - Varnish Cache 7.1.2 release and download information.
- [Varnish Cache 7.2.0](https://www.varnish.org/releases/7.2.0/) - Varnish Cache 7.2.0 release and download information.
- [Varnish Cache 7.0.3](https://www.varnish.org/releases/7.0.3/) - Varnish Cache 7.0.3 release and download information.
- [Varnish Cache 7.1.1](https://www.varnish.org/releases/7.1.1/) - Varnish Cache 7.1.1 release and download information.
- [Varnish Cache 7.1.0](https://www.varnish.org/releases/7.1.0/) - Varnish Cache 7.1.0 release and download information.
- [Varnish Cache 6.0.10](https://www.varnish.org/releases/6.0.10/) - Varnish Cache 6.0.10 release and download information.
- [Varnish Cache 6.6.2](https://www.varnish.org/releases/6.6.2/) - Varnish Cache 6.6.2 release and download information.
- [Varnish Cache 7.0.2](https://www.varnish.org/releases/7.0.2/) - Varnish Cache 7.0.2 release and download information.
- [Varnish Cache 6.0.9](https://www.varnish.org/releases/6.0.9/) - Varnish Cache 6.0.9 release and download information.
- [Varnish Cache 7.0.1](https://www.varnish.org/releases/7.0.1/) - Varnish Cache 7.0.1 release and download information.
- [Varnish Cache 7.0.0](https://www.varnish.org/releases/7.0.0/) - Varnish Cache 7.0.0 release and download information.
- [Varnish Cache 6.0.8](https://www.varnish.org/releases/6.0.8/) - Varnish Cache 6.0.8 release and download information.
- [Varnish Cache 6.5.2](https://www.varnish.org/releases/6.5.2/) - Varnish Cache 6.5.2 release and download information.
- [Varnish Cache 6.6.1](https://www.varnish.org/releases/6.6.1/) - Varnish Cache 6.6.1 release and download information.
- [Varnish Cache 6.6.0](https://www.varnish.org/releases/6.6.0/) - Varnish Cache 6.6.0 release and download information.
- [Varnish Cache 6.0.7](https://www.varnish.org/releases/6.0.7/) - Varnish Cache 6.0.7 release and download information.
- [Varnish Cache 6.5.1](https://www.varnish.org/releases/6.5.1/) - Varnish Cache 6.5.1 release and download information.
- [Varnish Cache 6.5.0](https://www.varnish.org/releases/6.5.0/) - Varnish Cache 6.5.0 release and download information.
- [Varnish Cache 6.4.0](https://www.varnish.org/releases/6.4.0/) - Varnish Cache 6.4.0 release and download information.
- [Varnish Cache 6.0.6](https://www.varnish.org/releases/6.0.6/) - Varnish Cache 6.0.6 release and download information.
- [Varnish Cache 6.2.3](https://www.varnish.org/releases/6.2.3/) - Varnish Cache 6.2.3 release and download information.
- [Varnish Cache 6.3.2](https://www.varnish.org/releases/6.3.2/) - Varnish Cache 6.3.2 release and download information.
- [Varnish Cache 6.0.5](https://www.varnish.org/releases/6.0.5/) - Varnish Cache 6.0.5 release and download information.
- [Varnish Cache 6.2.2](https://www.varnish.org/releases/6.2.2/) - Varnish Cache 6.2.2 release and download information.
- [Varnish Cache 6.3.1](https://www.varnish.org/releases/6.3.1/) - Varnish Cache 6.3.1 release and download information.
- [Varnish Cache 6.3.0](https://www.varnish.org/releases/6.3.0/) - Varnish Cache 6.3.0 release and download information.
- [Varnish Cache 6.0.4](https://www.varnish.org/releases/6.0.4/) - Varnish Cache 6.0.4 release and download information.
- [Varnish Cache 6.2.1](https://www.varnish.org/releases/6.2.1/) - Varnish Cache 6.2.1 release and download information.
- [Varnish Cache 6.2.0](https://www.varnish.org/releases/6.2.0/) - Varnish Cache 6.2.0 release and download information.
- [Varnish Cache 6.0.3](https://www.varnish.org/releases/6.0.3/) - Varnish Cache 6.0.3 release and download information.
- [Varnish Cache 4.1.11](https://www.varnish.org/releases/4.1.11/) - Varnish Cache 4.1.11 release and download information.
- [Varnish Cache 6.0.2](https://www.varnish.org/releases/6.0.2/) - Varnish Cache 6.0.2 release and download information.
- [Varnish Cache 6.1.1](https://www.varnish.org/releases/6.1.1/) - Varnish Cache 6.1.1 release and download information.
- [Varnish Cache 6.1.0](https://www.varnish.org/releases/6.1.0/) - Varnish Cache 6.1.0 release and download information.
- [Varnish Cache 6.0.1](https://www.varnish.org/releases/6.0.1/) - Varnish Cache 6.0.1 release and download information.
- [Varnish Cache 4.1.10](https://www.varnish.org/releases/4.1.10/) - Varnish Cache 4.1.10 release and download information.
- [Varnish Cache 6.0.0](https://www.varnish.org/releases/6.0.0/) - Varnish Cache 6.0.0 release and download information.
- [Varnish Cache 4.1.9](https://www.varnish.org/releases/4.1.9/) - Varnish Cache 4.1.9 release and download information.
- [Varnish Cache 5.2.1](https://www.varnish.org/releases/5.2.1/) - Varnish Cache 5.2.1 release and download information.
- [Varnish Cache 5.2.0](https://www.varnish.org/releases/5.2.0/) - Varnish Cache 5.2.0 release and download information.
- [Varnish Cache 0.9](https://www.varnish.org/releases/0.9/) - Varnish Cache 0.9 release and download information.
- [Varnish Cache 0.9.1](https://www.varnish.org/releases/0.9.1/) - Varnish Cache 0.9.1 release and download information.
- [Varnish Cache 1.0.1](https://www.varnish.org/releases/1.0.1/) - Varnish Cache 1.0.1 release and download information.
- [Varnish Cache 1.0.2](https://www.varnish.org/releases/1.0.2/) - Varnish Cache 1.0.2 release and download information.
- [Varnish Cache 1.0.3](https://www.varnish.org/releases/1.0.3/) - Varnish Cache 1.0.3 release and download information.
- [Varnish Cache 2.0.1](https://www.varnish.org/releases/2.0.1/) - Varnish Cache 2.0.1 release and download information.
- [Varnish Cache 2.0.2](https://www.varnish.org/releases/2.0.2/) - Varnish Cache 2.0.2 release and download information.
- [Varnish Cache 2.0.3](https://www.varnish.org/releases/2.0.3/) - Varnish Cache 2.0.3 release and download information.
- [Varnish Cache 2.1.3](https://www.varnish.org/releases/2.1.3/) - Varnish Cache 2.1.3 release and download information.
- [Varnish Cache 4.1.0](https://www.varnish.org/releases/4.1.0/) - Varnish Cache 4.1.0 release and download information.
- [Varnish Cache 4.1.1](https://www.varnish.org/releases/4.1.1/) - Varnish Cache 4.1.1 release and download information.
- [Varnish Cache 4.0.5](https://www.varnish.org/releases/4.0.5/) - Varnish Cache 4.0.5 release and download information.
- [Varnish Cache 4.1.8](https://www.varnish.org/releases/4.1.8/) - Varnish Cache 4.1.8 release and download information.
- [Varnish Cache 5.1.3](https://www.varnish.org/releases/5.1.3/) - Varnish Cache 5.1.3 release and download information.
- [Varnish Cache 4.1.7](https://www.varnish.org/releases/4.1.7/) - Varnish Cache 4.1.7 release and download information.
- [Varnish Cache 5.1.2](https://www.varnish.org/releases/5.1.2/) - Varnish Cache 5.1.2 release and download information.
- [Varnish Cache 5.1.1](https://www.varnish.org/releases/5.1.1/) - Varnish Cache 5.1.1 release and download information.
- [Varnish Cache 4.1.4](https://www.varnish.org/releases/4.1.4/) - Varnish Cache 4.1.4 release and download information.
- [Varnish Cache 4.1.5](https://www.varnish.org/releases/4.1.5/) - Varnish Cache 4.1.5 release and download information.
- [Varnish Cache 4.0.4](https://www.varnish.org/releases/4.0.4/) - Varnish Cache 4.0.4 release and download information.
- [Varnish Cache 5.0.0](https://www.varnish.org/releases/5.0.0/) - Varnish Cache 5.0.0 release and download information.
- [Varnish Cache 4.1.3](https://www.varnish.org/releases/4.1.3/) - Varnish Cache 4.1.3 release and download information.
- [Varnish Cache 4.1.6](https://www.varnish.org/releases/4.1.6/) - Varnish Cache 4.1.6 release and download information.
- [Varnish Cache 4.1.2](https://www.varnish.org/releases/4.1.2/) - Varnish Cache 4.1.2 release and download information.
- [Varnish Cache 3.0.7](https://www.varnish.org/releases/3.0.7/) - Varnish Cache 3.0.7 release and download information.
- [Varnish Cache 4.0.3](https://www.varnish.org/releases/4.0.3/) - Varnish Cache 4.0.3 release and download information.
- [Varnish Cache 3.0.6](https://www.varnish.org/releases/3.0.6/) - Varnish Cache 3.0.6 release and download information.
- [Varnish Cache 4.0.2](https://www.varnish.org/releases/4.0.2/) - Varnish Cache 4.0.2 release and download information.
- [Varnish Cache 4.0.1](https://www.varnish.org/releases/4.0.1/) - Varnish Cache 4.0.1 release and download information.
- [Varnish Cache 4.0.0](https://www.varnish.org/releases/4.0.0/) - Varnish Cache 4.0.0 release and download information.
- [Varnish Cache 3.0.5](https://www.varnish.org/releases/3.0.5/) - Varnish Cache 3.0.5 release and download information.
- [Varnish Cache 3.0.4](https://www.varnish.org/releases/3.0.4/) - Varnish Cache 3.0.4 release and download information.
- [Varnish Cache 3.0.3](https://www.varnish.org/releases/3.0.3/) - Varnish Cache 3.0.3 release and download information.
- [Varnish Cache 3.0.2](https://www.varnish.org/releases/3.0.2/) - Varnish Cache 3.0.2 release and download information.
- [Varnish Cache 3.0.1](https://www.varnish.org/releases/3.0.1/) - Varnish Cache 3.0.1 release and download information.
- [Varnish Cache 3.0.0](https://www.varnish.org/releases/3.0.0/) - Varnish Cache 3.0.0 release and download information.
- [Varnish Cache 2.1.5](https://www.varnish.org/releases/2.1.5/) - Varnish Cache 2.1.5 release and download information.
- [Varnish Cache 2.1.4](https://www.varnish.org/releases/2.1.4/) - Varnish Cache 2.1.4 release and download information.
- [Varnish Cache 2.1.2](https://www.varnish.org/releases/2.1.2/) - Varnish Cache 2.1.2 release and download information.
- [Varnish Cache 2.1.1](https://www.varnish.org/releases/2.1.1/) - Varnish Cache 2.1.1 release and download information.
- [Varnish Cache 2.1](https://www.varnish.org/releases/2.1/) - Varnish Cache 2.1 release and download information.
- [Varnish Cache 2.0.6](https://www.varnish.org/releases/2.0.6/) - Varnish Cache 2.0.6 release and download information.
- [Varnish Cache 2.0.5](https://www.varnish.org/releases/2.0.5/) - Varnish Cache 2.0.5 release and download information.
- [Varnish Cache 2.0.4](https://www.varnish.org/releases/2.0.4/) - Varnish Cache 2.0.4 release and download information.
- [Varnish Cache 2.0](https://www.varnish.org/releases/2/) - Varnish Cache 2.0 release and download information.
- [Varnish Cache 1.1.2](https://www.varnish.org/releases/1.1.2/) - Varnish Cache 1.1.2 release and download information.
- [Varnish Cache 1.1.1](https://www.varnish.org/releases/1.1.1/) - Varnish Cache 1.1.1 release and download information.
- [Varnish Cache 1.0.4](https://www.varnish.org/releases/1.0.4/) - Varnish Cache 1.0.4 release and download information.
- [Varnish Cache 1.1](https://www.varnish.org/releases/1.1/) - Varnish Cache 1.1 release and download information.
- [Varnish Cache 1.0](https://www.varnish.org/releases/1/) - Varnish Cache 1.0 release and download information.
- [Documentation](https://www.varnish.org/docs/) - Installation guides, extra VMODs, and configuration documentation for Varnish Cache.
- [Extra Varnish Cache features](https://www.varnish.org/docs/extra-features/) - Learn about the extra Varnish features that are part of the Varnish Cache distribution.
- [Security, bugs & vulnerabilities](https://www.varnish.org/docs/security/)
- [The Varnish Reference Manual](https://www.varnish.org/docs/reference/)
- [The Varnish Users Guide](https://www.varnish.org/docs/users-guide/)
- [Varnish tutorials](https://www.varnish.org/docs/tutorials/)
- [What’s new in Varnish?](https://www.varnish.org/docs/whats-new/) - What are the new features, changes, and improvements for the different versions of Varnish
- [Install guide](https://www.varnish.org/docs/install-guide/) - Learn how to install Varnish Cache on the supported platforms.
- [](https://www.varnish.org/business/)


## Extra VMODs

Varnish Cache ships these modules beyond what Vinyl Cache provides:

- vmod-accept: Sanitize content-negotiation headers
- vmod-bodyaccess: Access and cache based on request body
- vmod-header: Manipulate duplicate HTTP headers
- vmod-saintmode: Mark backends sick per-object
- vmod-str: String utilities (count, substring, split, match)
- vmod-tcp: TCP congestion control and throttling
- vmod-var: Variable support in VCL
- vmod-vsthrottle: Rate limiting per key
- vmod-xkey: Surrogate key (tag-based) cache invalidation
- vmod-cfg: Access env vars, INI/JSON/Lua/JS config files
- vmod-digest: HMAC signatures, hashes, base64
- vmod-fileserver: Serve files directly without a backend
- vmod-geoip2: MaxMind GeoIP lookups
- vmod-jq: JSON parsing with jq-style filters
- vmod-querystring: URL querystring filtering and sorting
- vmod-redis: Redis client for VCL
- vmod-reqwest: HTTP client and dynamic backends with SSL
- vmod-rers: Advanced regex with response body manipulation
- vmod-uuid: RFC 4122 UUID generation

## Source Code

- GitHub: https://github.com/varnish/varnish