How to add headers to an nginx response?

To add headers to an nginx response, you can use the add_header directive in your nginx configuration file. Here is an example:

location /endpoint {
    # other directives
    add_header X-Custom-Header "Custom Header Value";
}

In this example, X-Custom-Header is the name of the header, and Custom Header Value is the value of the header. You can add as many headers as you need by including multiple add_header directives within the applicable location block in your nginx configuration.

Note that while add_header adds the header to the response, you can also modify the values of existing headers using the add_header directive with the same header name as what you want to modify.