Problem

PATCH requests to non-existent resources return 404, but in Solid, PATCH should be able to create resources using N3 Patch with solid:inserts.

Error from PodOS:

Web error: 404 (Not Found) on PATCH of http://localhost:3210/agsdf

Solution

Modify handlePatch to:

1. If resource doesn't exist, start with an empty JSON-LD document ({ "@context": {}, "@graph": [] })
2. Apply the patch to create the resource
3. Return 201 Created instead of 204 No Content when a new resource is created

This aligns with the Solid protocol where PATCH can be used for resource creation, not just updates.

Changes

• handlePatch now creates resources if they don't exist
• Returns 201 for creation, 204 for updates
• If-Match header only checked when resource exists