One response carrying several independent outcomes, for a request that operated on more than one resource. Each element has its own status.
The trap is treating the 207 itself as success. Individual operations inside it may have failed, and only the per-item statuses will tell you.
2 endpoints in this playground answer with 207. Every one is free, needs no signup, and can be called from the browser or with curl.
POST https://funapi.dev/api/friends/v1/characters/bulk — Partial success — some items failed validation (Friends API)POST https://funapi.dev/api/friends/v1/characters/bulk-delete — Partial success — some ids did not exist (Friends API)All HTTP status codes · All 37 mock REST APIs · Getting started guide