Optional ReadonlyanalyticsOptional ReadonlyendpointThe endpoint family, when the request builder knows it better than the edge.
Never media-upload: that kind is the host's (isMediaUploadRequest), so a
request cannot declare itself an upload, nor an upload anything else.
Optional ReadonlyfeaturesReadonlyidentityOptional ReadonlyscopeApp lifecycle scope issuing the request; drives API host selection, never headers.
ReadonlysurfaceOptional Readonlywaterfall
App surface a request reports in
x-fb-request-analytics-tags(surface); defaults to"undefined"on the REST path.