Documentation inconsistent on accept header value

Important HTTP request headers shows sending */* for the Accept header:

In every request should be present these HTTP headers, otherwise request could fail.

Accept: */*

However examples in various methods, such as Login, show the Accept header set to application/json:

curl --request POST \
  --url \
  --header 'Accept: application/json' \
  --header 'Api-Key: ' \
  --header 'Content-Type: application/json' \
  --header 'User-Agent: ' \
  --data '{
  "username": "string",
  "password": "string"

I would think the normal REST API requests sent by clients should use application/json as shown in the examples. Only the special GET request for the subtitle file contents would need to use */*.

What is the best practice?