c# httpclient azure function authorization

//Append URL with code and key or add x-functions-key header.
"https://myazurecloudfunctions.azurewebsites.net/api/SayHi?code=udXhf3pviSICFMtViW/pqmV/1Q5vLH5aMcRWXfD/q6NXk2VVxRlfYw=="