How to customize response headers in nginx

Question

Just want to add custom fields to the response header

曾经蜡笔没有小新 · Answer

add_header 'Some-header' 'someValue';

I think you can find a bunch of answers to this question in a hundred searches. .
But if I ask here again, I must have encountered other problems. .

Warm reminder of a pitfall. For response headers defined by nginx, remember not to use underscores. When taking this header, in some languages, such as PHP.
What you define isSome-header，取是取HTTP_SOME_HEADER