header
Parameters
value
Use the value of a header in the request as an aggregate key. Each distinct value in the header contributes to the aggregation instance. If you use a single header as your custom key, then each value fully defines an aggregation instance.
Parameters
argument
Use the value of a header in the request as an aggregate key. Each distinct value in the header contributes to the aggregation instance. If you use a single header as your custom key, then each value fully defines an aggregation instance.