fix(start): enable HEAD requests to API HEAD/GET routes

[paularmstrong]

Fixes #1657

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• infrastructure changes
• Other... Please describe:

What is the current behavior?

HEAD requests to API endpoints fail, unable to define them manually

What is the new behavior?

1. Allows export const HEAD: APIHandler = async () => { … }; as API endpoints
2. Falls back on GET api methods if no HEAD function is defined.

Other information

[changeset-bot]

🦋 Changeset detected

Latest commit: 9f26122

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@solidjs/start	Patch

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pnpm add https://pkg.pr.new/@solidjs/start@1661

commit: 9f26122