Enables you to specify HTTP headers to add to the request.
The list of values that correspond sequentially to any path variables in your endpoint ARN (for example arn:aws:execute-api:us-east-1:123456:myapi/*/POST/pets/*).
arn:aws:execute-api:us-east-1:123456:myapi/*/POST/pets/*
Represents keys/values of query string parameters that are appended to the invoked endpoint. //