Set X-Error for thrown Responses

[Brendonovich]

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?

Responses thrown inside server functions don't get re-thrown on the client, as they aren't sent to the client with X-Error set.

What is the new behavior?

X-Error will be set when Responses are thrown inside server functions

Other information

Having read through solidjs/solid-router#387, maybe this header should only be set for thrown redirects? Though personally I'd expect returning/throwing to be isomorphic no matter what is returned/thrown

Closes #1512

[changeset-bot]

🦋 Changeset detected

Latest commit: a654a66

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

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR