OptionalextraOptionalresponseOptionalsignal?: AbortSignalOptionalstacWhether the API advertises POST /search.
STAC API - Item Search requires GET /search and makes POST optional,
so the POST support has to be discovered rather than assumed: servers
list the endpoint on the landing page as a rel="search" link per
method (stac-fastapi / pgstac and stac-server emit both a GET and a
POST link). The probe runs at most once per instance and resolves to
false when the landing page is unreachable or advertises no POST
search link, so callers fall back to the universally supported GET.
Optionalsignal: AbortSignal
STAC API entry point. Discovery (
landing,collections,collection) plus search (search,searchAll,searchStream) and item fetch.