Set an HTTP header on this single PostgREST request, overriding any header with the same name set on the client.
This is an advanced escape hatch for one-off needs (passing a custom Authorization for a single query, attaching a tracing header, etc.). Most callers do not need it: configure client-wide headers via the headers option when constructing the client, and authentication via Supabase Auth.
HTTP header name
HTTP header value