IETF Publishes RFC 10008, Introducing HTTP QUERY Method for Complex API Queries

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The Internet Engineering Task Force (IETF) published RFC 10008 in June 2026, formally introducing the HTTP QUERY method as a Proposed Standard. The new method was registered by IANA as both safe and idempotent, filling a long-standing gap in HTTP semantics. For years, API developers had to choose between cramming complex filters into unwieldy GET query strings or misusing POST — which is neither safe nor idempotent — purely to carry structured query bodies. The QUERY method allows a request body to carry complex, structured query data while preserving the semantic meaning of a read-only, repeatable operation. RFC 10008 clarifies that simple queries should still use GET, reserving QUERY for cases where filters are too large or structured to be expressed cleanly in a URI.

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