Execute SPARQL queries using HTTP POST method. Use this when your queries are too long to fit in a URL (typically over 2000 characters) or when you want to avoid having the query appear in server logs. The query is sent in the request body as application/x-www-form-urlencoded data. Supports all the same query types as the GET endpoint. Essential for complex queries with multiple UNION clauses, complex FILTERs, or large VALUES blocks.
Original spec description
Execute a SPARQL query using POST method. Useful for very long queries that exceed URL length limits.