VCL Support for Parameters in Custom Subs

All blog posts

• VCL Support for Parameters in Custom Subs

  Katherine Flavel

  Learn about Fastly's VCL syntax updates, including return values and parameters for custom subroutines, enabling better code reuse and abstraction.

  November 06, 2025

  DevOps

  Engineering

  

• Building Scalable Waiting Rooms with Fastly Compute

  Brock Norvell, Terri Allegretto, + 1 more

  Control website traffic and prevent server overload with Fastly Compute waiting rooms. Learn how to build scalable, customizable queues for high-demand events.

  November 05, 2025

  Compute

  + 4 more

  

• Optimizing Web Performance: Unpacking Fastly’s Intelligent Compression Defaults

  Stephen Stierer, Anjan Srinivas

  Optimize web performance with Fastly's intelligent compression defaults. Learn how Gzip and Brotli shrink payload sizes, reduce costs, and speed up your site.

  November 03, 2025

  CDN & Delivery

  + 2 more

  

• Rewriting HTML with the Fastly JavaScript SDK

  Sy Brand

  Boost web performance with Fastly’s JS SDK v3.35.0. Use the new streaming HTML rewriter to customize, cache, and transform pages faster and more efficiently.

  October 30, 2025

  Compute

  + 4 more

  

• Resilience by Design: Lessons in Multi-Cloud Readiness

  Austin Spires

  Stay online when it matters most. Learn how Fastly's multi-cloud and edge strategies protect against outages, keeping your systems fast and reliable.

  October 30, 2025

  CDN & Delivery

  + 2 more

  

• A Smarter ACME Challenge for a Multi-CDN World

  Shiloh Heurich

  Optimize your multi-CDN setup with Fastly's new dns-account-01 ACME challenge. Eliminate label collisions and enhance certificate management.

  October 29, 2025

  CDN & Delivery

  + 3 more

  

• Increasing the accessibility of managed security services

  Cody Arnold

  Make world-class protection accessible. Fastly’s new Managed Security Professional delivers 24/7 expert defense for your most critical apps and APIs.

  October 28, 2025

  Product

  Security

  

• Build for Scale: Fastly’s Principles of Distributed Decision Making and Self-healing Systems

  Brian Haberman

  Learn how Fastly's distributed decision-making and self-healing systems build a resilient, high-performance network. Discover key benefits and examples.

  October 23, 2025

  

• Your API Catalog Just Got an Upgrade

  Lorraine Bellon, Anna Jensen

  Discover, monitor, and secure your APIs with Fastly API Discovery. Get instant visibility, cut the noise, and keep your APIs secure and compliant.

  October 21, 2025

  Security

  Product

  

• 3 Costly Mistakes in App and API Security and How to Avoid Them

  David King, Ashley Hurwitz

  Avoid costly app and API security mistakes. Learn how to streamline WAF evaluation, estimate TCO, and embrace agile development for optimal security.

  October 20, 2025

  Security

  DevOps

  

• DDoS in September

  Liam Mayron, David King, + 1 more

  Fastly's September 2025 DDoS report details modern application attacks. Get insights and guidance to strengthen your security initiatives.

  October 17, 2025

  Security

  Industry insights

  

• How to Tame Varnish Memory Usage Safely

  Daniel Axtens

  How Fastly turned a shelved Varnish idea into 25% fewer memory writes and real system-wide gains.

  October 09, 2025

  CDN & Delivery

  + 4 more

  

• In AI We Trust? Increasing AI Adoption in AppSec Despite Limited Oversight

  Natalie Lightner

  AI adoption in AppSec is soaring, yet oversight lags. Explore the paradox of trust vs. risk, false positives, and the future of AI in application security.

  October 08, 2025

  Security

  Industry insights

  

• The CDN Showdown: Fastly Outpaces Akamai in Real-World Performance

  John Agger

  As user expectations rise and milliseconds define outcomes, choosing a modern, high-speed CDN is no longer optional but a strategic imperative. Independent Google data shows Fastly consistently outperforms Akamai in real-world web performance.

  October 08, 2025

  

• Design for Chaos: Fastly’s Principles of Fault Isolation and Graceful Degradation

  Brian Haberman

  Learn how Fastly builds a resilient CDN through fault isolation & graceful degradation. Discover our principles for minimizing disruption & ensuring continuous service.

  October 07, 2025

  CDN & Delivery

  + 4 more

  

• Fastly's Seven Years of Recognition as a Gartner® Peer Insights™ Customers’ Choice

  Kim Ogletree

  Fastly was named a 2025 Gartner® Peer Insights™ Customers’ Choice for Cloud WAAP, marking seven consecutive years of recognition driven by customer trust and reviews.

  October 01, 2025

  Company news

  + 2 more

  

• Make Sense of Chaos with Fastly API Discovery

  Lorraine Bellon, Anna Jensen

  Discover, monitor, and secure your APIs with Fastly API Discovery. Get instant visibility, cut the noise, and keep your APIs secure and compliant.

  September 30, 2025

  Security

  Product

  

• From Climate Week NYC to Fastly’s 100% Renewable Commitment

  Eoghan Kelly

  Fastly commits to 100% renewable electricity coverage across its global network and offices, advancing a sustainable internet and supporting customers' climate goals.

  September 29, 2025

  Company news

  Culture

  

• 4 Tips for Developers for Using Fastly’s Sustainability Dashboard

  Leon Brocard

  Track the real-world emissions of your Fastly workloads. This blog shares practical tips on using the Sustainability dashboard for greener, faster code.

  September 25, 2025

  Performance

  + 3 more

  

• Fastly’s Pillars of Resilience: Building a More Robust Internet

  Brian Haberman

  Discover Fastly's Pillars of Resilience: unwavering availability, minimized latency, and disruption resistance for a robust internet experience with our global network.

  September 24, 2025

  CDN & Delivery

  + 4 more