📂 Request-Response Protocol
# Client
Table of Contents
A client is a contract that makes Airnode requests.
While making a request, the client refers to a requester by its requesterIndex, which means "fulfill my request with the designated wallet of the requester identified by requesterIndex".
Doing so requires the client to be endorsed by the said requester.
Note that the client is the contract that makes the request. The client may specify the request such that the request is fulfilled by the provider's Airnode calling back another contract.