fix: fix error on directly use transformRequest api

[dejour]

Description

fix #3798

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
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[patak-dev]

I don't think this is the correct change, or if there is a change needed. See my comment at the issue #3798 (comment).

In case we would like to support this, we could initialize the cache when the plugin is created, and reset it at build start. But IMO, plugins are meant to be used in the context of an initialized server.

[dejour]

I'm skeptical about using plugin this way too. so feel free to close this pull request.