[T] HttpProperty

type HttpProperty =
  | HeaderProperty
  | CookieProperty
  | ContentTypeProperty
  | QueryProperty
  | PathProperty
  | StatusCodeProperty
  | BodyProperty
  | BodyRootProperty
  | MultipartBodyProperty
  | BodyPropertyProperty;

A visible request or response property classified by its HTTP role. The discriminant distinguishes wire metadata, explicit body roots, and implicit body members.