Support guides

Getting started

These articles provide basic instructions for getting started with Fastly services.

Basics

These articles provide basic information and instructions for configuring Fastly services after getting started.

Domains & Origins

These articles describe configuration settings and changes you can make to your domains and origins when setting up Fastly services.

Performance

These articles describe how to adjust the performance of Fastly's services beyond standard configuration methods.


Configuration

These articles provide basic instructions for configuring Fastly services after getting started.

Basics

These articles provide basic information and instructions for configuring Fastly services after getting started.

Conditions

These articles describe conditions and how to use them in VCL and the Fastly web interface.

Dictionaries

These articles describe how to move rapid key/value pair decision logic to the edge using dictionaries.

Domains & Origins

These articles describe configuration settings and changes you can make to your domains and origins when setting up Fastly services.

Request settings

These articles describe configuration settings and changes you can make to your request settings when setting up Fastly services.

Cache settings

These articles describe configuration settings and changes you can make to your cache settings when setting up Fastly services.

Headers

These articles describe configuration settings and changes you can make to your headers when setting up Fastly services.

Responses

These articles describe configuration settings and changes you can make to your response settings when setting up Fastly services.

Performance

These articles describe how to adjust the performance of Fastly's services beyond standard configuration methods.

Custom VCL

These articles describe how to create your own VCL files with specialized configurations.

Image optimization

These articles provide basic instructions for and examples of setting up and beginning to use the Fastly Image Optimizer.

Video

These articles describe setup and configuration guidelines for setting up live stream delivery or video on-demand.


Security

These articles provide information about the administrative, physical, and technical safeguards that protect the Fastly CDN service, as well as describe how to secure communications between Fastly and your origin servers and customers.

Access Control Lists

These articles describe how to restrict access to resources by allowing or blocking IP addresses with access control lists (ACLs).

Monitoring and testing

These articles provide information about monitoring and testing the security of services behind Fastly.

Securing communications

These articles describe how to secure communications between Fastly, your origin servers, and your customers.

Security measures

These articles provide information about the administrative, physical, and technical safeguards that protect the Fastly CDN service.

TLS

These articles describe how to set up TLS certificates with Fastly services.

Web Application Firewall

These articles provide information about the Fastly Web Application Firewall (WAF) security service.


Integrations

These articles describe how non-Fastly services interoperate with Fastly.

Logging endpoints

These articles describe Fastly's support for protocols that allow you to stream logs to a variety of locations, including third-party services, for storage and analysis.

Non-Fastly services

These articles describe how non-Fastly services interoperate with Fastly.


Diagnostics

These articles describe how to log data, troubleshoot problems, and tune performance.

Streaming logs

These articles describe support real-time log streaming of data that passes through Fastly.

Debugging techniques

Because Fastly doesn't store customer logs, we provide information about debugging techniques that help you gain insights into your service configurations.

Common errors

These articles describe common errors you may encounter when setting up and configuring Fastly services.


Account info

These articles describe how to manage account access, billing, and security.

Account management

These articles describe how to manage account access.

Billing

These articles describe Fastly's billing and payment plans and how to make adjustments to your billing information.

User access and control

These articles describe how to manage users with permission to access to your account.


Reference

These articles provide reference information about common Fastly terms and configuration settings.



Products

Products and services

These articles provide plain English descriptions and details about Fastly's products and features and their paths through Fastly's product lifecycle. They also describe service level agreements offered by Fastly that provide information to customers based on the nature of their agreement with Fastly and the Fastly products they have purchased.


Legacy offerings

These articles provide information about Fastly's legacy offerings.


Third-party information

These articles provide information about third-party technology and services incorporated into the Fastly CDN service.



VCL

Content negotiation

Functions

Cryptographic

Functions

Date and time

Functions

Variables

Edge Side Includes (ESI)

Variables

Floating point classification

Functions

Geolocation

Variables

Math constants and limits

Variables

Math rounding

Functions

Math trigonometric

Functions

Miscellaneous

Functions

Variables

Query string manipulation

Functions

Randomness

Functions

Server

Variables

Size

Variables

Table

Functions

TLS and HTTP/2

Functions

Variables

UUID

Functions

Custom VCL

VCL Snippets


API


Changes