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Functions are predefined actions that may be invoked with arguments, and return a value. VCL offers a wide range of predefined functions, but currently does not offer the option of defining custom functions.

• Content negotiation
• Cryptographic
• Date and time
• Floating point classifications
• Headers
• Math logexp
• Math rounding
• Math trig
• Miscellaneous
• Query string
• Randomness
• Rate limiting
• Strings
• TLS and HTTP
• Table
• UUID