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@Steve it seems that headers are supported by Enhanced External Services:https://help.salesforce.com/articleView?id=enhanced_external_services.htm&type=5"Enhanced External Services is an improved way to connect to outside services. New registrations can handle more-complex OpenAPI 2.0 schema, nested object types and send parameters as headers within the HTTP requests. They are not subject to Apex word and character limitations. New registrations can continue to benefit from other capabilities as they become available."