The Varnish Configuration Language (VCL) is a small domain-specific language designed to be used to define request handling within Varnish. It is extremely flexible and allows you to let Varnish do exactly whatever you want or need it to do.
Varnish Software Blog
The Varnish blog is where our team writes about all things related to Varnish Cache and Varnish Software...or simply vents.
SUBSCRIBE TO OUR BLOG
Recent Posts
Posts by Topic
- Varnish Cache (87)
- VCL (54)
- Varnish Plus (38)
- Varnish Software (21)
- Varnish Summit (20)
- web performance (20)
- e-commerce (16)
- CDN (15)
- VMODs (15)
- HTTP streaming (14)
- video streaming (14)
- live streaming (13)
- Black Friday (12)
- Open Source (12)
- CDNs (10)
- Varnish Professional Services (10)
- varnish administration console (10)
- DIY CDNs (9)
- varnishtest (9)
- web caching (9)
- web scalability (9)
- Varnish Plus Cloud (8)
- content delivery (8)
- scalability (8)
- API management (7)
- APIs (7)
- Security (7)
- TLS (7)
- diy cdn (7)
- e-commerce performance (7)
- mobile web performance (7)
- ott streaming (7)
- parallel ESI (7)
- private CDN solution (7)
- professional services (7)
- ssl (7)
- streaming (7)
- AWS (6)
- GDPR (6)
- VAC (6)
- Varnish Massive Storage Engine (6)
- Varnish custom statistics (6)
- Varnish10years (6)
- hybrid CDN solution (6)
- varnish for streaming (6)
- web traffic peaks (6)
- Edgestash (5)
- HTTP2 (5)
- MSE (5)
- VHA (5)
- Varnish Cache Plus (5)
- Varnish Configuration Language (5)
- Varnish High Availability (5)
- Varnish integration with Akamai (5)
- Varnish training (5)
- caching (5)
- cybersecurity (5)
- load balancing (5)
- mobile performance (5)
- product training (5)
- Advanced Cache Invalidation (4)
- Akamai Connector for Varnish (4)
- TLS/SSL (4)
- US presidential election (4)
- VCL best practices (4)
- VCS (4)
- Varnish Extend (4)
- Varnish Plus Cloud AWS (4)
- Varnish migration (4)
- Varnish wiki (4)
- cloud computing (4)
- high availabiity (4)
- how to migrate from Varnish 3 to Varnish 4 (4)
- mobile web user experience (4)
- paywall (4)
- real-time statistics (4)
- total encryption (4)
- varnish enterprise (4)
- video content delivery (4)
- website scaling (4)
- API engine (3)
- Akamai (3)
- CacheFly (3)
- Cookies (3)
- JSON (3)
- Persistence (3)
- Using Varnish to speed up Magento (3)
- Varnish Cache anniversary (3)
- Varnish Software Partners (3)
- VoD streaming (3)
- access control (3)
- authentication (3)
- authorization (3)
- cache invalidation (3)
- cloud (3)
- e-learning (3)
- edge computing (3)
- edge logic (3)
- encryption (3)
- gdpr compliance (3)
- high availability (3)
- hitch (3)
- how to stream live video (3)
- increase web performance (3)
- intelligent caching (3)
- optimize mobile content delivery (3)
- optimizing mobile for e-commerce (3)
- prefetching content (3)
- transport security (3)
- varnish mistakes (3)
- varnishlog (3)
- video delivery (3)
- virtual infrastructure (3)
- web performance black friday (3)
- webinar (3)
- 2016 (2)
- Adobe CQ (2)
- CDN Security (2)
- Cedexis (2)
- Community (2)
- ESI (2)
- Euro 2016 (2)
- Getting started with Varnish (2)
- Github (2)
- H/2 (2)
- HAProxy (2)
- HTTP (2)
- HTTP/2 (2)
- IBC (2)
- IoT (2)
- MSE with persistence (2)
- Magento (2)
- PROXY protocol (2)
- Performance (2)
- Rust (2)
- Singles' Day (2)
- Streaming in Germany (2)
- Super Bowl (2)
- TCP acceleration (2)
- TTL management (2)
- The Varnish Book (2)
- URLs (2)
- VMOD (2)
- Varnish 3 (2)
- Varnish 4 (2)
- Varnish API Engine (2)
- Varnish Awards (2)
- Varnish Cache awards (2)
- Varnish Cache migration (2)
- Varnish Plus Cloud Google Cloud Platform (2)
- Varnish Plus migration (2)
- Varnish Testing (2)
- Varnish automation (2)
- Varnish tips and tricks (2)
- VarnishCon (2)
- VoD (2)
- api acceleration (2)
- asynchronous operation (2)
- backends (2)
- caching dynamic CDN content (2)
- cloud caching (2)
- content delivery solution (2)
- data protection (2)
- debugging (2)
- debugging Varnish (2)
- development (2)
- dynamic backends (2)
- event (2)
- events (2)
- grace in Varnish (2)
- hidden VMODs (2)
- holiday shopping (2)
- m-commerce (2)
- managed services (2)
- massive storage engine (2)
- mobile shopping (2)
- multi-factor authentication (2)
- online shopping (2)
- phishing attacks (2)
- prefetch (2)
- preparing for viral video delivery (2)
- prewarming the cache (2)
- probes (2)
- regex (2)
- retail web performance (2)
- rewriting URLs (2)
- securing content delivery (2)
- streaming trends (2)
- using VCL (2)
- using Varnish (2)
- varnish (2)
- varnish cache 5.0 (2)
- varnish events (2)
- varnish modules (2)
- varnishstat (2)
- vmod-http (2)
- waf (2)
- web acceleration (2)
- web application firewall (2)
- web content performance (2)
- web security (2)
- web speed (2)
- web traffic spikes (2)
- zipnish (2)
- 2018 predictions (1)
- 5G (1)
- ACL (1)
- API architecture (1)
- API call management (1)
- API call performance (1)
- API performance (1)
- Adobe dispatcher (1)
- Alexa (1)
- Amazon Web Services (1)
- Amsterdam (1)
- Amsterdam, 2016 (1)
- Apache (1)
- Asmterdam (1)
- C (1)
- CA SSO (1)
- CBC (1)
- CMS performance (1)
- CSR (1)
- Christmas code freeze (1)
- Compression (1)
- Content Delivery World (1)
- Cyber Monday (1)
- DDoS (1)
- DNS (1)
- DataDog (1)
- David Bowie (1)
- Docker (1)
- Drupal (1)
- Drupal 8 (1)
- Drupal performance (1)
- ESI e-commerce (1)
- ESI media publishers (1)
- Encoding (1)
- Endeca (1)
- Etag header (1)
- Eventbrite (1)
- Glenn Frey (1)
- Google Assistant (1)
- HA (1)
- HTTPS (1)
- IBC 2019 (1)
- IP address (1)
- Improve Drupal performance (1)
- June (1)
- Magento2 (1)
- Microsoft Azure (1)
- Mustache (1)
- NGINX (1)
- New York Times (1)
- O'Reilly book (1)
- OCSP stapling (1)
- OSCON (1)
- Olympics (1)
- PHK (1)
- Pinterest (1)
- Routing (1)
- SFR (1)
- SFR CDN (1)
- SSO (1)
- ScaleUp Awards (1)
- Sharding (1)
- Shibboleth (1)
- Single sign-on (1)
- Siri (1)
- Skills Matter (1)
- StackWorld Awards (1)
- Streaming Media Readers' Choice Awards (1)
- Super Bowl advertising (1)
- Super Bowl campaigns (1)
- Super Tuesday (1)
- Survey (1)
- TTL (1)
- Tesla (1)
- Tesla CDN (1)
- UI (1)
- Ubuntu (1)
- Use Varnish to boost Drupal performance (1)
- User Security (1)
- Using Varnish with Magento (1)
- V credit bundles (1)
- V credits (1)
- VCL snippets (1)
- VCS API (1)
- VCT (1)
- VMOD tutorial (1)
- VMOD-accept (1)
- VMOD-str (1)
- VPOP (1)
- Varnish 4.1 (1)
- Varnish 5.0 (1)
- Varnish Administration training (1)
- Varnish Award for Value (1)
- Varnish Cache Plus relocation support (1)
- Varnish Health Check (1)
- Varnish Plus Audit (1)
- Varnish Plus Cloud Azure (1)
- Varnish Plus Open Partners (1)
- Varnish Plus Quick Start (1)
- Varnish Plus versus Varnish Plus Cloud comparison (1)
- Varnish Shared Memory Log (1)
- Varnish Training Academy (1)
- Varnish and Docker (1)
- Varnish and Drupal (1)
- Varnish and Endeca (1)
- Varnish as load balancer (1)
- Varnish as media server (1)
- Varnish for Academia (1)
- Varnish for authentication and authorization (1)
- Varnish lab (1)
- Varnish on cloud platforms (1)
- Varnish solutions (1)
- Varnish support (1)
- Wikipedia (1)
- WordPress (1)
- Zipkin (1)
- accept headers (1)
- access roles in Varnish Administration Console (1)
- advanced Varnish training (1)
- advanced cookie handling (1)
- app performance (1)
- architectural efficiency (1)
- asking server about content freshness (1)
- automation (1)
- avoiding varnish mistakes (1)
- awards (1)
- backend health (1)
- backend shield (1)
- backend website traffic (1)
- bandwidth for streaming (1)
- bandwidth shaping (1)
- beer (1)
- beer brewing (1)
- benchmark parallel vs serial ESI processing (1)
- benchmarking high availablility performance (1)
- brewing (1)
- broadcast (1)
- broadcasting trends (1)
- brotli (1)
- business benefits of hybrid DIY CDN (1)
- cache encryption (1)
- cache hit rate (1)
- cache hit ratio (1)
- cache locking (1)
- cache persistence (1)
- cache warming (1)
- caching for web performance (1)
- caching goals (1)
- caching policy (1)
- caching vs cookies (1)
- case study (1)
- climate change (1)
- cluster (1)
- configurability (1)
- configuration (1)
- containers (1)
- content access control (1)
- content delivery network (1)
- content delivery solution providers (1)
- content freshness (1)
- content replication (1)
- continue serving traffic in a server outage (1)
- control content (1)
- cost of digital content delivery (1)
- creating a VMOD (1)
- custom VCL (1)
- custom VMODs (1)
- custom Varnish development (1)
- cyber threats (1)
- cybercrime (1)
- data visualization (1)
- delivering live content (1)
- device detection (1)
- digital content (1)
- directors (1)
- dynamic CDN content (1)
- e-commerce customer expectations (1)
- e-commerce security (1)
- edge-side includes (1)
- education (1)
- energy consumption (1)
- ensure website uptime (1)
- enterprise search (1)
- faster Endeca search (1)
- fatal varnish mistakes (1)
- five reasons to migrate to latest Varnish version (1)
- fixing Varnish issues (1)
- football (1)
- future of streaming (1)
- get started with Varnish (1)
- getting started with Varnish Cache (1)
- git (1)
- going green (1)
- google cloud platform (1)
- goto (1)
- goto-vmod (1)
- grace (1)
- gzip (1)
- health check (1)
- history of Varnish Cache (1)
- hit-for-pass (1)
- how to create your own VMOD (1)
- how to hurricane-proof a web server (1)
- how to install Varnish on Ubuntu (1)
- how to use Varnish (1)
- identifying web performance issues (1)
- improve WordPress performance with Varnish (1)
- infrastructure in the cloud (1)
- install and test varnish in 5 steps (1)
- installing Varnish on Ubuntu (1)
- internet of things (1)
- internet security (1)
- jemalloc (1)
- latency (1)
- latest version of Varnish Cache (1)
- linear streaming (1)
- live streaming capacity (1)
- live streaming via commercial CDN (1)
- live video content delivery (1)
- maintaining control of your content (1)
- malloc (1)
- marketing campaign perofrmance (1)
- maximum uptime (1)
- media (1)
- memory (1)
- metering (1)
- microservices (1)
- mobile web (1)
- multi-tiered caching (1)
- multimedia content delivery (1)
- named-vmod (1)
- need-based elasticity (1)
- net neutrality (1)
- network scale (1)
- news (1)
- online shopping safety (1)
- open source network proxy (1)
- origin protect (1)
- origin shield (1)
- page load time (1)
- page size (1)
- paid content (1)
- paris (1)
- paywall technology (1)
- per-page metering (1)
- performance monitoring app (1)
- platform support (1)
- preventing downtime (1)
- product (1)
- protecting API server (1)
- proxies (1)
- purging (1)
- quick start aws (1)
- real-time insight on connected devices (1)
- reduce streaming costs (1)
- removing and putting back a backend (1)
- replace Adobe dispatcher with Varnish Plus (1)
- request mirroring (1)
- resiliency (1)
- reverse proxy (1)
- running Varnish (1)
- running Varnish inside a container (1)
- saint mode (1)
- saint mode in Varnish (1)
- scale up for unpredictable web traffic (1)
- search query performance (1)
- secure e-shopping (1)
- securing Varnish with Hitch (1)
- serial ESI (1)
- server health (1)
- server overload (1)
- servers (1)
- social media (1)
- socket pacing (1)
- spdy (1)
- speed up WordPress with Varnish (1)
- speed up mobile content delivery (1)
- stale content (1)
- sticky session with cookies (1)
- sticky sessions (1)
- storage (1)
- store-and-forward proxying (1)
- streaming architecture (1)
- streaming in asia (1)
- streaming key trends (1)
- streaming video bandwidth (1)
- streaming video costs (1)
- stud (1)
- super fast purger (1)
- supported open source software (1)
- systematic content validation with Varnish (1)
- team building (1)
- tech predictions (1)
- testing varnish (1)
- tiered paywall (1)
- top ten Varnish questions (1)
- top ten need to know about varnish (1)
- tuning (1)
- university access control (1)
- use Varnish to speed up Endeca (1)
- use Varnish to speed up WordPress (1)
- varnish cloud (1)
- varnish essentials (1)
- varnish installation (1)
- varnish internal conference (1)
- varnish live (1)
- varnish software events (1)
- varnish startup guide (1)
- varnishadm (1)
- varnishtop (1)
- video on demand (1)
- viral video (1)
- vmod-cookieplus (1)
- vmod-json (1)
- vmod_rewrite (1)
- vmod_session (1)
- voice services (1)
- web page loading (1)
- web performance monitoring (1)
- web scaling (1)
- web traffic (1)
- website performance (1)
- website resilience (1)
- website scalability (1)
- website user mapping (1)
- what you can do with Varnish modules (1)
- white paper (1)
- whiteboard sessions (1)
- women in tech (1)
- wordpress2blogger (1)
0 Comments