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    "WebService module" -> "HTTP::AnyUA->request"
    "HTTP::AnyUA->request" -> "Real user agent,\ne.g. HTTP::Tiny" [label="   Transform request and response  "]
    "Real user agent,\ne.g. HTTP::Tiny" -> "internet"
    "internet" -> "Real user agent,\ne.g. HTTP::Tiny"
    "Real user agent,\ne.g. HTTP::Tiny" -> "HTTP::AnyUA->request"
    "HTTP::AnyUA->request" -> "WebService module"
}