drupflare/worker - v1.0.0
    Preparing search index...

    Variable CFW_HEADER_VERSIONConst

    CFW_HEADER_VERSION: "1" = '1'

    The x-cfw-* header contract version.

    Bumped when a header is RENAMED or REMOVED, not when one is added: a reader that knows version 1 can ignore fields it does not recognise, but it cannot tell a rename from an absent worker without this.