fix(server): skipped for ended response

[antfu]

Description

In middleware mode, or with plugins that interact with the dev server, the request might be handled before Vite sending them out (in our case, the Nuxt integration, nuxt/nuxt#11881). This result error:

Cannot set headers after they are sent to the client

This PR makes the server skip closed response.

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• 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.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes nuxt/framework#123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[patak-dev]

Should we also check before to avoid doing unnecessary work? For example, before going through the pipeline, or when this middleware quicks in?

vite/packages/vite/src/node/server/middlewares/indexHtml.ts

Line 161 in 13d41d8

html = await server.transformIndexHtml(url, html, req.originalUrl)