409 list_entry_exists - NoResponse docs

{
  "type": "https://docs.noresponse.org/problems/list-entry-exists",
  "title": "List entry exists",
  "status": 409,
  "detail": "The value is already on the environment's list; delete its entry first.",
  "code": "list_entry_exists",
  "request_id": "5e8be3a91fde9499f7ce48ae66290895"
}

{
  "type": "https://docs.noresponse.org/problems/list-entry-exists",
  "title": "List entry exists",
  "status": 409,
  "detail": "The value is already on the environment's list; delete its entry first.",
  "code": "list_entry_exists",
  "request_id": "5e8be3a91fde9499f7ce48ae66290895"
}

HTTP 409 Not retryable

Why

A value is on the list of an environment once, with one action. NoResponse compares the canonical form of the value, so Mail.Example.com and example.com are the same domain.

What to do

To change the action of the value, delete its entry with DELETE /v1/workspaces/{workspace_id}/lists/{environment}/{list_entry_id}, then add the value again.

In the SDKs

The Node and Python SDKs raise ConflictError. The Go SDK returns *apierrors.ConflictError, which you match with errors.As.

{
  "type": "https://docs.noresponse.org/problems/list-entry-exists",
  "title": "List entry exists",
  "status": 409,
  "detail": "The value is already on the environment's list; delete its entry first.",
  "code": "list_entry_exists",
  "request_id": "5e8be3a91fde9499f7ce48ae66290895"
}

Every error has this shape. Errors and limits lists every code.