OptionalapiHTTP header name that carries the API key on outbound requests (e.g.,
Ocp-Apim-Subscription-Key). The value forwarded under this header is
supplied via api_key_value.
OptionalapiSecret value forwarded under the api_key_name header on outbound
requests. Supplied as inline plaintext via ProviderSecret.plaintext.
Header-based API-key authentication for a custom provider: the secret is forwarded on outbound requests under a caller-chosen HTTP header, as
<api_key_name>: <api_key_value>.