Configuration

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

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

• Caching configuration best practices
• Controlling caching
• Enabling API caching
• Implementing API cache control
• Overriding caching defaults based on a backend response
• Preventing cache poisoning via HTTP X-headers
• Segmented Caching

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

• About conditions
• Troubleshooting conditions
• Using conditions

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

• About VCL Snippets
• Basic authentication
• Custom responses that don't hit origin servers
• Guide to VCL
• Isolating header values without regular expressions
• Manipulating the cache key
• Response Cookie handling
• Understanding the different PASS action behaviors
• Uploading custom VCL
• Using dynamic VCL Snippets
• Using regular VCL Snippets
• VCL regular expression cheat sheet

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

• About dictionaries
• Working with dictionaries using the web interface

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

• Changing origins based on user location
• Failover configuration
• IPv6 support
• Maintaining separate HTTP and HTTPS requests to origin servers
• Routing assets to different origins
• Setting up redundant origin servers
• Specifying an override host
• Using Fastly with apex domains

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

• Adding or modifying headers on HTTP requests and responses
• Enabling cross-origin resource sharing (CORS)
• Removing headers from backend response
• Setting Content Type based on file extension

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

• About Fastly Image Optimizer

These articles provide information about distributing requests across multiple servers to optimize resource use and avoid overloading any single resource.

• About Dynamic Servers
• Automatic load balancing
• Creating and using pools with Dynamic Servers
• Creating and using server entries with Dynamic Servers

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

• Enabling automatic gzipping
• Enabling HTTP/3 for Fastly services
• Failure modes with large files
• HTTP/2 server push
• Making query strings agnostic
• Precision Path
• Serving stale content
• Streaming Miss

These articles describe how to purge cache.

• Authenticating URL purge requests via API
• Purging a URL via the web interface
• Purging all content via the web interface
• Purging with surrogate keys
• Setting Surrogate-Key headers for Amazon S3 origins
• Soft purges
• Wildcard purges
• Working with surrogate keys

These articles describe configuration settings and changes you can make to requests when working with Fastly services.

• Checking multiple backends for a single request
• Conditionally changing a URL
• How request settings are applied

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

• Creating and customizing a robots.txt file
• Creating error pages with custom responses
• Responses tutorial

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

• Adaptive bitrate playback URL guidelines
• Collecting OTFP metrics
• Streaming configuration guidelines