request help: can support no service backend? only use plugin for routing processing.

[Donghui0]

Issue description:

in scenarios: deny the route to be accessed, just use the uri-blocker plugin, no need to configure the service backend property.

[tokers]

A default backend might be useful in such a case.

[tao12345666333]

Please provide more infromations

[github-actions[bot]]

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[github-actions[bot]]

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