Refactor rendercode.ts to remove duplicates

[tibisabau]

Summary

Refactored rendercode.ts to eliminate code duplication between renderRequest()
and renderResponse() functions by extracting common rendering logic into a
shared private function.

Related issue

• closes Reduce the duplicated codes in rendercode.ts #415

Changes

• Extracted common rendering logic from renderRequest() and renderResponse()
  into a private render() function
• Modified renderRequest() to construct its status line and delegate to
  render()
• Modified renderResponse() to construct its status line and delegate to
  render()

Benefits

• Reduced code duplication by approximately 20 lines of duplicate code
• Improved maintainability - changes to the rendering logic now only need to
  be made in one place
• Preserved existing functionality and public API without breaking changes
• Type-safe implementation using Request | Response union type

Checklist

• Did you add a changelog entry to the CHANGES.md?
• Did you write some relevant docs about this change (if it's a new feature)?
• Did you write a regression test to reproduce the bug (if it's a bug fix)?
• Did you write some tests for this change (if it's a new feature)?
• Did you run mise test on your machine?

Additional notes

The code in this pull request was generated by GitHub Copilot with the Claude Sonnet 4.5 model.

[gemini-code-assist]

Summary of Changes

Hello @tibisabau, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the rendercode.ts file to significantly reduce code duplication within the renderRequest and renderResponse functions. By extracting their shared logic into a new private render helper function, the change enhances maintainability and readability without altering the external behavior or public API. This ensures that future modifications to the rendering process only need to be applied in a single location.

Highlights

• Code Duplication Removal: Extracted common rendering logic from renderRequest() and renderResponse() into a new private render() function.
• Refactored renderRequest(): Modified renderRequest() to construct its status line and delegate the rest of the rendering to the new render() function.
• Refactored renderResponse(): Modified renderResponse() to construct its status line (including handling statusText fallback) and delegate the rest of the rendering to the new render() function.
• Improved Maintainability: Reduced code duplication by approximately 20 lines, enhancing maintainability and ensuring type safety with the Request | Response union type.

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[gemini-code-assist]

Code Review

This pull request effectively refactors rendercode.ts to remove duplicated logic between renderRequest() and renderResponse() by introducing a shared render() function. The change improves code maintainability and is well-executed. I have a couple of minor suggestions to remove redundant await keywords, which is a good practice for performance.

[gemini-code-assist]

The await keyword is not necessary when returning a promise from an async function like this. You can return the promise directly, which avoids creating an unnecessary microtask and is slightly more performant.

Suggested change

	return await render(request, statusLine);
	return render(request, statusLine);

[gemini-code-assist]

Similar to the comment on renderRequest, the await keyword is redundant here and can be removed.

Suggested change

	return await render(response, statusLine);
	return render(response, statusLine);

[dahlia]

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