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STRING, read-only.

Available inall subroutines.

The version of the service currently executing. Takes the form:

{serviceID}.{version}_{generation}-{hash}

Where:

• {serviceID} is the ID of the Fastly service.
• {version} is the service version, an integer that increases each time the service configuration is cloned.
• {generation} is an integer that increases each time the service is purged. See req.vcl.generation.
• {hash} is a hashsum of the VCL code.