Admin API Patching request to update Split definition fails with 400 Bad Request

Problem

Admin API allow updating existing Split Definitions, when using the curl command below to add a key into an existing individual target section, it always fail with 400 Bad Request

curl -v -X PATCH -d '[{"op": "add", "path": "/treatments/0/keys/-", "value": "key1"}]' -H "Authorization: Bearer ADMIN API KEY" -H "Content-Type: application/json" https://api.split.io/internal/api/v2/splits/ws/[Workspace ID]/[Split Name]/environments/[Environment Name]

HTTP/2 400 
< strict-transport-security: max-age=15770000; includeSubDomains
< vary: Cookie
< content-length: 0

* Connection #0 to host api.split.io left intact

Root Cause

With the introduction of Approval Requests in Split UI, the Workspace configuration has Require title and comments for split, segment and metric changes checkbox option. If it is checked, it is required from the UI and Admin API to provide a title and comment when changing Split Definitions.

Solution

Add the title and comment optional parameters in the URL query as below

curl -v -X PATCH -d '[{"op": "add", "path": "/treatments/0/keys/-", "value": "key1"}]' -H "Authorization: Bearer ADMIN API KEY" -H "Content-Type: application/json" https://api.split.io/internal/api/v2/splits/ws/[Workspace ID]/[Split Name]/environments/[Environment Name]?title=Split-Engineer-Testing&comment=Split-Engineer-Testing-Comment