Custom VCL

VCL Snippets are short blocks of VCL logic that can be included directly in your service configurations. They're ideal for adding small…

Best practices in Fastly VCL have changed over time to help address expectation gaps and improve maintainability. This page covers some of…

In normal operation, a request directed to a Fastly POP will be handled by two separate cache servers acting together in a process we call…

Customize your content delivery.

If a fatal error occurs in your service while processing your VCL logic, Fastly will generate an error response with a 503 HTTP status…

Fastly VCL is a domain specific programming language which has evolved from the Varnish proxy cache , which is part of Fastly's platform…

Fastly’s Edge Cloud services use the Fastly Varnish Configuration Language (VCL), a scripting language used to configure and add logic to…

Fastly supports the ability to extract header subfield values without regular expressions in a human-readable way. Headers subfields are…

Before you begin If your origin uses special values (e.g., request headers) to select content for users or to otherwise direct requests to…

Being able to track information related to your origin can be helpful in troubleshooting errors and making sure requests are processed as…

Passing with a request setting and with a cache setting triggers very different behavior in Varnish . Within VCL, passing with a…

Fastly allows you create your own Varnish Configuration Language (VCL) files with specialized configurations. By uploading custom VCL files…

Dynamic VCL Snippets are one of two types of snippets that allow you to insert small sections of VCL logic into your service configuration…

Regular VCL Snippets are one of two types of snippets that allow you to insert small sections of VCL logic into your service configuration…

Fastly VCL uses a subset of Perl Compatible Regular Expression (PCRE) syntax. This is case sensitive and forward slashes don't need to be…

Fastly は、オリジンサーバーにヒットさせたくない特定のリクエストに対して、カスタムレスポンスを送信することができます。 クイックレスポンスを作成する Fastly では、 robots.txt ファイル の作成や 404と50…