The header name (e.g., 'DD-APPLICATION-KEY').
OptionalsecretAccount secret providing the header value. Accepts a secret name or 'sec*' id on writes; reads always return the 'sec*' id.
OptionalvalueLiteral header value. Stored in plaintext and returned by reads - use 'secret' for credentials or other sensitive values.
An additional header applied to upstream requests alongside the primary credential. The value comes from an account secret or a literal string; exactly one of 'secret' and 'value' must be set.