Retrieves comments and post details from a Reddit post by URL. Returns the post with title, author, score, ups, upvote_ratio, num_comments, and created_utc, plus a comments array where each comment includes author, body, body_html, score, created_utc, parent_id, permalink, and nested replies. Both GET and POST are supported. Use GET for normal requests. Pass one opaque cursor exactly as returned by more.cursor or replies.more.cursor to load the next page. Cursor batching and comma-separated cursor values are not supported. If an opaque cursor becomes too large after extensive pagination, use P Uses the caller's OpenAny gateway credentials. Charges and authorization are determined by the gateway.