Which of the following is NOT a part of an HTTP request?

In the HubSpot Data Integration certification, Output is identified as NOT a part of an HTTP request because it refers to the information sent back from the server after a request has been processed, rather than a component of the initial call. An HTTP request is composed of the Request URL (the destination endpoint), the Method (the action to be performed, such as GET or POST), and the Body (the data payload being sent), along with headers for authentication and metadata. Since the "Output" is technically the result contained within the HTTP response, it sits outside the structure of the request itself, serving as the culmination of the API interaction rather than an input parameter.